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Walailak Journal of Science and Technology     Open Access  
Web Ecology     Open Access   (Followers: 6)
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West African Journal of Applied Ecology     Open Access  
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Journal Cover Memoirs of the Association of Australasian Palaeontologists
  [SJR: 0.462]   [H-I: 6]   [2 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 0810-8889
   Published by RMIT Publishing Homepage  [403 journals]
  • Issue 40 - Fossil corals of Australia, New Zealand, New Guinea and
           Antarctica: Bibliography and index
    • Abstract: Pickett, John W
      A bibliography and index of all published fossil coral research on material from Antarctica, Australia, New Guinea and New Zealand is presented, covering 1343 species group names, 607 genus group names and 639 bibliographic references. The indexed section begins with a list of all genera mentioned, sorted alphabetically under subclasses, and listing all taxa referred to them. Then follow alphabetical lists of all species level taxa, again sorted by subclass, with references to all their mentions in the literature. Before the final bibliography there are sorted reference lists to the literature by geological age, relevant country, and by subject according to the main thrust of the article.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - The Alexander Terrane of Alaska - a Displaced Fragment of
           Northeast Russia': Evidence from Silurian-middle Devonian Megafossils
           and Stratigraphy
    • Abstract: Blodgett, Robert B; Boucot, Arthur J; Rohr, David M; Pedder, Alan EH
      There has been various speculation on the palaeogeographical origins of the Alexander Terrane of Southeast Alaska, the suggestions including eastern Australia, Baltica or even Siberia. Close affinities have previously been noted between the Silurian-Devonian fossil faunas of the Alexander terrane and those of the Farewell terrane (primarily with the Nixon Fork subterrane) of west-central and southwestern Alaska. An overview of the Silurian to Middle Devonian faunas of the Alexander terrane, along with its gross stratigraphic succession, indicates that it is also closely allied with the Omulevsk Mountains (Omulevka terrane) of Northeast Russia. The late Silurian brachiopod fauna of the Omulevsk Mountains includes a number of distinctive species otherwise reported only from Southeast Alaska. The Silurian to Middle Devonian stratigraphic succession of the southern part of the Alexander terrane (i.e., western Prince of Wales Island) mimics the gross stratal succession in the Omulevsk Mountains. In the Alexander terrane, lower Silurian deep-water rocks of the Descon Formation are succeeded by shallow-water carbonates of the Heceta Limestone (late Llandovery-Ludlow), and overlain in turn by red bed clastics of the Karheen Formation (interpreted here to be of latest Silurian age in its type area). The Mirninskaya Suite of the Omulevsk Mountains represents a close analog of the Karheen and is of the same age. Clastic red bed units of this age are rare or absent elsewhere in the Palaeo-Pacific Ocean or in the Urals. The Lower and Middle Devonian brachiopod and gastropod faunas of the Alexander terrane also demonstrate close alliance with those of the Farewell terrane, which in turn are also closely allied with contemporaneous faunas of Northeast Russia (especially from the Omulevka terrane). The Omulevka and allied terranes within the Kolyma-Omolon superterrane of Northeast Russia are thought by many Russian workers to represent locally derived blocks rifted from the eastern margin of the Siberian palaeocontinent during Late Devonian-early Carboniferous time. The sharing of so many elements (both fauna and stratigraphy) makes the rift origin of the Alexander terrane from Northeast Russia at the same time a very appealing hypothesis.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Latest Devonian (Strunian) Ostracoda from the Buttons
           Formation, Bonaparte Basin, Northwestern Australia: Biostratigraphy,
           Palaeoecology and Palaeozoogeography
    • Abstract: Jones, Peter J
      Twenty-seven ostracod species are reviewed and referred to 22 benthic genera: Armenites, Bairdia (Bairdia), Bairdia (Rectobairdia), Baschkirina, Beyrichiopsis, Cavellina, Chamishaella, Coeloenellina, Cryptocyprois, Diphyochilina, Geisina, Indivisia, Katatona, Knoxites, Marginia, Notoscapha, Parabolbinella, Parabouchekius, Rhytiobeyrichia, Serenida, Shishaella, Sulcella and Urftella'. The fauna also includes the eridostracan Cryptophyllus. Species newly described are Beyrichiopsis' anogma, Beyrichiopsis teicherti and Serenida' alta; species newly recorded are Bairdia (Rectobairdia) aff. philippovae Egorov, 1953, Cryptocyprois sp. cf. C. subgibberosa Buschmina, 1977, Indivisia baschkirica Rozhdestvenskaya & Tschigova, 1972, Parabolbinella sp. A and Parabolbinella sp. B. Three biozones [Sulcella (Postsulcella) altifrons Zone, Diphyochilina tryphera Zone and Bairdia (Bairdia) ordensis Zone] are established and used for local correlation. Palaeoecologically, the ostracods are interpreted as indigenous, low energy thanatocoenoses, representing an Eifelian mega-assemblage, and are indicative of a shallow, generally well oxygenated lagoonal environment, below storm wave base. A gradual salinity increase is indicated by the appearance of stenohaline marine bairdioids in the upper part of the Buttons Formation. Long range correlation of this cosmopolitan ostracod fauna is with the late Famennian (Strunian, in particular). Strong zoogeographic links exist with the western margins of Palaeotethys (North Africa, Spain, France, Belgium, Poland), the East European Platform and Kazakhstan. Weaker links are with South China, northeast Russia (Omolon Massif) and the Cordilleran Province of North America. Benthic ostracods, lacking a pelagic larval stage, could not have crossed deep oceanic barriers. The observed zoogeographic links probably indicate that the shallow shelves of the western part of Gondwana and Laurentia-Baltica were close enough to permit genetic exchange and migration during transgressive pulses, along juxtaposed shallow shelves of the adjacent blocks of Gondwana and Laurentia-Baltica. A similar connection probably existed between the South China Plate and northwestern Australia, via terranes within the eastern end of the palaeotethyan equatorial belt.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Statistically Differentiating 'Katastrophomena' from
           'Strophomena' (Ordovician-silurian Strophomenid Brachiopods)
    • Abstract: Bing, Huang; Jiayu, Rong
      The Ordovician-Silurian strophomenid brachiopod genera 'Katastrophomena' and 'Strophomena' have been assigned to the subfamilies Furcitellinae and Strophomeninae respectively, but these genera are so similar that there exist different opinions on their taxonomic assignments. In order to differentiate these two genera statistically, thirty one species assigned to 'Katastrophomena' and 'Strophomena' were studied using discriminant analysis (DA). This is a practical statistical technique of classification in biosystematics that has, however, received less attention in palaeontology than in biological research. From measurements of length and width of shells and ventral muscle fields, a discriminant function was built using DA and its validity was tested. The results indicate that DA can be used to differentiate 'Katastrophomena' from 'Strophomena' by the ratio of ventral muscle field to valve length. The method is applied to three Chinese Llandovery species, 'Strophomena depressa, S. maxima' and 'S. modesta' which, as a result, are reassigned to 'Katastrophomena'. It is difficult to distinguish Strophomeninae from Furcitellinae and more work is required on differentiating them.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Lower and Middle Devonian Trilobites from Southern Uzbekistan
    • Abstract: Owens, Robert M; Ivanova, Olga; Kim, Irina; Popov, Leonid E; Feist, Raimund
      Thirty-one trilobite species belonging to the families Harpetidae, Scutelluidae, Proetidae, Tropidocoryphidae, Aulacopleuridae, Scharyiidae, Cheiruridae, Encrinuridae, Calymenidae, Lichidae and Odontopleuridae are documented from the Lower and Middle Devonian of the Uzbek part of south Tien-Shan (north Nuratau, Turkestan and Zerafshan ranges). New genera are the tropidocoryphids Metaxaphorus and Aidynsaia and the scutelluid Yolkinella, and new species are Scutellum meiorum, Yolkinella yolkini, Cornuproetus kimi and Scharyia kitabica. Many taxa from the Zerafshan Range are shared with Bohemia, the Carnic Alps and Morocco, whilst those from the north Nuratau and Turkestan ranges have more in common with those from the Altai-Sayan region of south-west Siberia.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Telychian-early Sheinwoodian (Early Silurian) Conodont-,
           Graptolite-, Chitinozoan- and Event-based Chronostratigraphy Developed
           Using the Graphic Correlation Method
    • Abstract: Kleffner, Mark A; Barrick, James E
      Graphic correlation of 24 previously uncompiled stratigraphic sections with the Silurian Composite Standard of Kleffner (1995) results in the addition of much new conodont, graptolite and chitinozoan range data, the first data on bentonite levels, recognition and filling in of a Telychian unconformity within the Pterospathodus amorphognathoides amorphognathoides conodont biozone in the Standard Reference Section (SRS; Cellon, Austria), verification of a previously recognised and filled in Telychian unconformity in the SRS (Kleffner 1989), and a revised Telychian-early Sheinwoodian (early Silurian) Composite Standard (CS) that has worldwide applicability as a high-resolution chronostratigraphy. The early Silurian CS is divisible into 15 conodont chronozones, 11 graptolite chronozones and two subchronozones, and six chitinozoan chronozones and one subchronozone, most of which are defined in the same manner as previously recognised biozones for those taxa. The Telychian-early Sheinwoodian CS includes 28 bentonites, 17 of which occur in at least two sections belonging to the CS. Because only one bentonite has yielded a reliable radiometric date, the new CS cannot be scaled relative to absolute ages. In the Telychian-early Sheinwoodian CS, correlation of the conodont, graptolite and chitinozoan chronozones comprising the CS compares favourably to recent correlation of Telychian-early Sheinwoodian conodont and graptolite zones and conodont and chitinozoan zones. The level for the base of the Wenlock in the Global Boundary Stratotype Section and Point in Hughley Brook, Shropshire, Great Britain, graphically correlates to a position in the upper part of the Cyrtograptus murchisoni Chronozone, within the Upper Pseudooneotodus bicornis Chronozone (between Datum 2 and Datum 3 of the Ireviken Event), within the upper part of the Margachitina margaritana Chronozone, and just above the Ireviken Bentonite.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Stratigraphic Distribution and Suggested Evolution of Dendroid
           Graptolites from the Silurian of Eastern Australia
    • Abstract: Rickards, Barrie; Wright, Anthony
      Five evolutionary lineages are proposed for Silurian species of the benthic dendroid graptolite genus Dictyonema, based largely on the exceptional eastern Australian records of the genus, comprising at least 25 species. These are: A, the delicatulum lineage with bifurcating ventral autothecal apertural spines; B, the paululum lineage with single ventral apertural spines or processes; C, the elegans lineage with isolated thecal apertures [plus-or-minus ] processes; D, the sherrardae lineage with dorsal apertural processes; and E, the venustum lineage with simple autothecal apertures. Brief comments are also made on other dendroid genera occurring in Australian strata, namely: Acanthograptus, Koremagraptus, Callograptus, Dendrograptus, Stelechocladia, Thallograptus and Palaeodictyota. Other non-graptoloid benthic hemichordates also listed are the tuboids Galaeograptus, Reticulograptus and Cyclograptus and the rhabdopleuran 'Rhabdopleura. Age ranges of all the species attributable to all of the above genera are tabulated.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Septal Architecture and Palaeoecology of 'Calceola' (Cnidaria,
           Calceolidae), with Comments on the Phylogeny of Devonian Operculate
           Tetracorals
    • Abstract: Wright, Anthony J
      In Calceola sandalina the full complement of counter major septa was established very low in the calyx, extending from the counter septum across to the edge of the counter face. At about mid-height of the calyx, a counter-lateral major septum was generated on either side of and from the counter septum. Serial minor septal insertion was initiated adjacent to the counter-lateral septa at a slightly later stage and continued throughout the subsequent ontogeny of the corallite, with minor septa (schizosepta') arising on the median side of major septa and bifurcating from them. Alar fossulae are seen in the calyx of mature corallites, on the counter side of a low ridge near the lateral extremity of the inner surface of the counter face. Insertion of major septa in the alar fossula has been observed rarely on the external counter face of worn corallites. The median septum in the operculum of C. sandalina is a compound structure which incorporates adjacent minor septa. In an Emsian(') corallite of 'Chakeola sp. minor septa are derived from major septa, new minor septa being generated on the outer side of major septa. This corallite also exhibits minor septa adjacent to the K septum, thus casting doubt on Birenheide's generalisation that the counter-lateral septa of C. sandalina are not separated from the counter septum by minor septa. In the Emsian Chakeola whitehousei minor septa are present adjacent to the counter septum of the operculum. The distal, anteriorly facing, projecting peg of the K septum of the corallite articulated within the large socket in the opercular K septum, and subsidiary grooves and plates on the socket and septum further facilitated interlocking. Knobs and/or small lists are developed along the posterior edge of the operculum, in the shelf inside the counter edge; septal pegs developed by septa in the corallite were accommodated within this shelf. The opercular septal blades interlocked loosely between the anteriorly facing, distal parts of septa of the corallite. Rare opercula show one or more (abortive') attempts to overcome damage which led to displacement of the operculum relative to the corallite, and rejuvenescence is exhibited to various degrees in many opercula. One operculum was apparently broken (bitten') in half as a juvenile, but was reconstructed to reach a mature form. Other specimens show epifauna, borings and bioerosion either on the external surface of the operculum or on the external cardinal surface of the corallite. 'Galls' on the inner opercular surface are interpreted as stereome deposited to seal off some type of internal parasite. In C. sandalina, tubules containing tabulae are located just inside the counter face, and may have served to house soft parts associated with the operculum. Changes of opercular septal morphology suggest that the phylogeny of Devonian genera of the Calceolidae is Rhizophyllum -> Savageola -> Chakeola -> Richtereola and ultimately, -> Calceola.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Silurian Brachiopod Distribution in Strata of the Canberra-Yass
           Region, Southeastern Australia
    • Abstract: Strusz, Desmond L
      Brachiopod faunas from Silurian strata in the Yass and Canberra districts of southeastern New South Wales and the Australian Capital Territory have been revised or described by the author in a number of papers between 1982 and 2010. In this paper, the stratigraphic distribution of the species of Rhynchonellata is displayed in a series of charts arranged by Order and level of first appearance. Stratigraphic correlation between the two neighbouring areas is based on detailed mapping by geologists of the former Bureau of Mineral Resources (now Geoscience Australia); biostratigraphy relies on incomplete sequences of conodont and graptolite zones in the Yass succession.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Devonian Scolecodonts from the Tyrnaueralm, Graz Palaeozoic,
           Austria
    • Abstract: Suttner, Thomas J; Hints, Olle
      A small assemblage of about 70 disarticulated polychaete jaws (scolecodonts) from Devonian limestones (Plabutsch Formation) at the Tyrnaueralm, Austria, represents the first discovery of these fossils within the Graz Palaeozoic. Due to tectonic development of the area and burial temperatures over 300 C the scolecodonts are diagenetically altered and fragmented, which impedes full taxonomic study. However, maxillae of paulinitids and probable polychaetaspids and kielanoprionids can be identified, indicating that the polychaete assemblages in the Graz area include representatives of families occurring in Devonian faunas in other parts of Europe and in North America. Based on local facies the polychaete jaws were deposited in back-reef or lagoonal settings.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - 'Stenoloron (Stenoloron) boucoti', a New Gastropod Species from
           the Lower Devonian of the Royal Creek area, Yukon Territory, Canada
    • Abstract: Blodgett, Robert B; Rohr, David M; Fryda, Jiri; Lenz, Alfred C
      A new Pragian gastropod species, Stenoloron (Stenoloron) boucoti, is established from the richly diverse Lower Devonian gastropod fauna of the Road River Formation in the Royal Creek area, Yukon Territory. This new species is a common element amongst Pragian gastropods from the Royal Creek fauna, and is also noted in coeval strata of the Delorme Formation, Northwest Territories, Canada. Both occurrences are within the Western Canada Province previously established by us for Lower Devonian gastropods of this area. This is the second occurrence of this Old World Realm genus and subgenus in North America. The only prior North American record was Stenoloron (Stenoloron) minor Blodgett and Johnson, 1992, from Eifelian (early Middle Devonian) age strata of the Denay Limestone of central Nevada.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - New Data on Occurrences of the Devonian Rugose Coral 'Calceola'
           in Belgium
    • Abstract: Wright, AJ; Coen-Aubert, M; Bultynck, P; van Viersen, AP
      Opercula and corallites of Calceola sandalina from the late Eifelian and early Givetian (Middle Devonian) Hanonet Formation of Belgium are illustrated. The few previous illustrations of calceoloid corals from the Devonian of Belgium did not include opercula showing the generically diagnostic morphological features, so for the first time the presence of the genus and species in Belgium is confirmed. One important corallite shows the alar septum and insertion of septa on the external surface of the counter face adjacent to the alar septum.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Silurian Spiriferide Brachiopods from Yass and Molong, New
           South Wales, and Canberra, Australian Capital Territory
    • Abstract: Strusz, Desmond L
      Six spiriferide species are now known from the Yass Silurian, of which only two had been previously described from there and are here revised: Janius bowningensis and Spirinella caecistriata. Placed in synonymy with the latter is the Canberra Wenlock species Reticulariopsis silurica. Also occurring in the Canberra Wenlock and now known from Yass is Endospirifer anxius. New are the eospiriferines Nanattegia yassensis gen. et sp. nov. and Hedeina bruntoni sp. nov., as well as an unnamed probable ambocoeliine. From Canberra is described Hedeina oepiki sp. nov., and from Molong (where it occurs with Spirinella caecistriata) the howellelline Rufispirifer nucula, a much-reported form known with confidence from the late Wenlock of Bohemia and Canberra, and the Ludlow of the sub-polar Urals.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - The Trilobite 'Chacomurus' (Dalmanitidae, Synphoriinae) from
           the Lower Devonian of Bolivia
    • Abstract: Holloway, David J
      The hitherto poorly known dalmanitid trilobite genus Chacomurus Branisa and Vanek, 1973, with type and only recognised species C. confragosus from the upper Lochovian or Pragian to Emsian of Bolivia, is revised and its morphology clarified. Its assignment to the subfamily Synphoriinae is supported. The genus is closely related to Coronura Hall and Clarke, 1888 from the Eifelian, both genera probably having their origins in a common ancestor in eastern North America during the Early Devonian.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Conodont Biostratigraphy and Stable Isotope Chemostratigraphy
           of the Lower Henryhouse Formation (Gorstian-early Ludfordian, Ludlow,
           Silurian), Southern Oklahoma, USA
    • Abstract: Barrick, James E; Klapper, Gilbert; Kleffner, Mark A; Karlsson, Haraldur R
      The lower member of the Henryhouse Formation (Ludlow-Pridoli) is a thin (
      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - First Record of the Devonian Phacopid Trilobite 'Plagiolaria'
           from Uzbekistan
    • Abstract: Cronier, Catherine; Tsmeyrek, Helena S
      Discovery of the Devonian phacopid trilobite 'Plagiolaria' in the Zeravshan Range of south-eastern Uzbekistan represents the second record of the genus from Central Asia, the other occurrence being that of P. 'schischkathensis' from Tadjikistan, also in the Zeravshan Range. The specimens from Uzbekistan, assigned to the new species P. kitabi, occur in siliceous-carbonate deposits that are tentatively considered by local workers to be of Famennian age, on the basis of limited conodont data. Plagiolaria is known elsewhere from the Pragian to Eifelian, so confirmation of a Famennian age for the Uzbekistan occurrence would extend the stratigraphical range of the genus considerably. Occurrences of 'Plagiolaria' in the Pragian-Emsian of Europe and in the Emsian-Eifelian of Asia suggest that the genus may have originated in the west and migrated to the east along the northern margin of Gondwana.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - Late Silurian Echinoderms from the Yass Basin, New South Wales
           - the Earliest Holothurian Body Fossil and Two Diploporitan Cystoids
           (Sphaeronitidae and Holocystitidae)
    • Abstract: Jell, Peter A
      Only a few echinoderms have been described from the upper Silurian sequence in the Yass Basin, New South Wales. A further two species described here are significant beyond extending the species list. Porosothyone picketti gen. et sp. nov. is the earliest recorded body fossil of a holothurian anywhere in the fossil record. Its elongate body wall is invested with many relatively large imbricating sieve plate skin ossicles resembling the Early Devonian Andenothyone from South America and the Triassic Strobilothyone from Spain. Trematocystis wrighti sp. nov. provides the first record of the well known European and North America Ordovician-Silurian Holocystites fauna in the Southern Hemisphere, and the first Silurian record of that fauna outside North America. The diploporitan cystoid Austrocystites Brown of the Sphaeronitidae is placed in synonymy with Eucystis Angelin, and a second specimen of its type species Eucystis branagani (Brown) is described to amplify its diploporitan features.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Issue 39 - 'Post-hoc' Sampling Analysis of Crinoid Collections from
           Anticosti Island, Quebec, Canada
    • Abstract: Ausich, William I
      The robustness of Ordovician-Silurian crinoid collections from Anticosti Island is evaluated using collection curves. This is possible because most of the crinoid specimens ever collected there are available for study. Collection curves are constructed using both the cumulative number of specimens and the cumulative number of hours spent collecting in each formation. Although more specimens await discovery, sampling is sufficient to interpret the evolutionary trends of crinoids through the end-Ordovician biotic collapse and recovery on Anticosti Island.

      PubDate: Fri, 23 Sep 2016 14:01:44 GMT
       
  • Volume 48 The early Cambrian tommotiid genus 'Dailyatia' from South
           Australia
    • Abstract: Skovsted, Christian B; Betts, Marissa J; Topper, Timothy P; Brock, Glenn A
      The camenellan tommotiid 'Dailyatia' is one of the most common fossils in shallow water carbonates from Cambrian Stages 2-4 in South Australia (Arrowie and Stansbury basins). Six species of Dailyatia are documented and new terminology for describing camenellan sclerites is introduced. 'Dailyatia' sclerites are found in three fundamental sclerite types (A-C), each of which may be present in one to three sub-types depending on species. The previously described species 'Dailyatia ajax' Bischoff 1976 and D. macroptera (Tate 1892) are revised and four additional species are described for the first time from South Australia. These include 'D. odyssei' Evans and Rowell 1990, previously known only from Antarctica, and two new species; 'D. bacata' sp. nov. and 'D. helica' sp. nov. as well as a species left under open nomenclature. Two of the recognised species ('D. macroptera' and 'D. helica') occur in two different ecophenotypic variants. Species and variants are defined by differences in sclerite types present in the scleritome, sclerite morphology and ornament. The sclerites of 'Dailyatia' are finely laminated with distal expansion of laminae supporting the prominent concentric ribs. The external surface is covered by a fine reticulate network which indicates that the sclerites were at least partly embedded in soft integument. The pattern of incremental growth reveals specific initial and possible gerontic growth stages with unique surface sculptures. Evidence of physical damage and growth disturbances is common in 'Dailyatia' sclerites and many specimens reveal preferential abrasion of the apex. Apical canals are present in all sclerites and are connected to specialised internal apical structures.

      The internal surface of the sclerites in most species reveals raised platforms and depressed, scar like areas forming unique patterns in each sclerite type, presumably representing muscular attachment. Two specimens revealing ontogenetic fusion of 'Dailyatia' sclerites have been recovered. Based on all available evidence, a new reconstruction of the 'Dailyatia' scleritome is proposed. In the reconstruction, a central row of A and paired B sclerites is flanked on both sides by one or two lateral rows of C sclerites. The exact number of sclerites may vary between species. This reconstruction is based on an assumed slug-like bodyplan and the Dailyatia animal is considered to be a vagrant, benthic animal living in and around archaeocyathan-microbial buildups and in other shallow water carbonate environments. The internal surface of the sclerites in most species reveals raised platforms and depressed, scar like areas forming unique patterns in each sclerite type, presumably representing muscular attachment. Two specimens revealing ontogenetic fusion of 'Dailyatia' sclerites have been recovered. Based on all available evidence, a new reconstruction of the 'Dailyatia' scleritome is proposed. In the reconstruction, a central row of A and paired B sclerites is flanked on both sides by one or two lateral rows of C sclerites. The exact number of sclerites may vary between species. This reconstruction is based on an assumed slug-like bodyplan and the 'Dailyatia' animal is considered to be a vagrant, benthic animal living in and around archaeocyathan-microbial buildups and in other shallow water carbonate environments.

      PubDate: Mon, 21 Dec 2015 23:49:02 GMT
       
  • Issue 47 - A late cretaceous (Cenomanian-Turonian) south polar palynoflora
           from the Chatham Islands, New Zealand
    • Abstract: Mays, Chris
      Forty palynofloral assemblages were obtained from the Waihere Bay and Tupuangi Beach outcrop successions of Pitt Island, Chatham Islands, New Zealand. All assemblages are from the Ngaterian-Mangaotanean (Cenomanian-Turonian) Tupuangi Formation, except one which is from the overlying Kahuitara Tuff. These strata likely represent the highest southern palaeolatitude (about 75-80 degreesS) locality of the mid-Cretaceous studied to date, an interval of extreme global greenhouse conditions. Samples yielded well preserved and moderately diverse plant miospore and megaspore assemblages. This study includes the taxonomic treatment of 37 spore taxa, 37 pollen taxa, two taxa of probable algal affinity and two taxa of unknown affinity (incertae sedis). These taxa include three newly described conifer species, Araucariacites mildenhallii sp. nov., Balmeiopsis disca sp. nov. and Podocarpidites microradiatus sp. nov., one emendation of a previously described species, Trichotomosulcites hemisphaerius, and two new binominal combinations, Retitriletes pseudoreticulatus and R. saturnalis. Quantitative data were collected for all taxa, and a statistical approach was employed to test the conspecificity of variant forms of common Cretaceous taxa. A pitted/foveolate sculpture was commonly observed across various disparate taxa; this was attributed to sample-specific exinal degradation, rather than taxonomic variation.

      The Tupuangi palynoflora differs from coeval high palaeolatitude assemblages of Gondwana in having a high diversity and extremely high abundance of conifer pollen. The quantitative data reveal intermittent, low diversity 'fern spikes', but conifer pollen abundance was greater than fern spore abundance in almost all samples. The abundance of probable freshwater algae and absence of marine microplankton throughout most of the succession supports a predominantly terrestrial setting for the Tupuangi Formation. Lycopod and non-vascular plant spores are moderately diverse, but represent minor components in all examined assemblages. Angiosperm pollen occur in low relative abundance in all the studied samples, and show a lower diversity compared to coeval lower palaeolatitude localities. The most abundant conifer groups were (in order of decreasing abundance): Cupressaceae, Podocarpaceae and Araucariaceae. The Tupuangi palynoflora suggests a Cupressaceae-dominated subprovince at the highest palaeolatitudes during the early Late Cretaceous.

      Representing an intermediate province between the assemblages of the Antarctic Peninsula and New Zealand/Australia, the Pitt Island palynoflora provides an important foundation for future mid-Cretaceous biostratigraphic and phytogeographic correlations of southern Gondwana.

      PubDate: Mon, 15 Jun 2015 15:29:09 GMT
       
  • Issue 46 - Ordovician (Darriwilian-early Katian) trilobite faunas of
           northwestern Tarim, Xinjiang, China
    • Abstract: Zhou, Zhiyi; Yin, Gongzheng; Zhou, Zhiqiang
      Seventy-one late Middle and Late Ordovician trilobite species belonging to 50 genera and subgenera, 24 families and 7 orders are described from northwestern Tarim, Xinjiang. Of these, 18 species and 2 genera (the nileid Paraperaspis and lichid Tairongia) are new. Much new morphological information is provided and ranges of variation are revealed for previously known forms on the basis of the new material. Ten trilobite biofacies developed during the Darriwilian-early Katian in relation to environmental gradients of the platform margin, shallow outer-shelf basin and outer-shelf slope are reviewed herein, taking account of the newly described and revised trilobite faunas. Eustatic changes that took place in the region, including a latest Darriwilian-Sandbian transgression and an early Katian regression, are suggested by the shoreward or seaward shifts and the vertical replacement of trilobite associations. Trilobites exhibit close biogeographic connections with the coeval faunas recorded in other terranes of peri-Gondwana, especially in South China, North China and Central Asia. The occurrence of some early Darriwilian genera that were previously considered as typical of either Laurentian (e.g. Nanillaenus, Kawina and Xystocrania) or Baltoscandian (Parillaenus, Panderia and Hemisphaerocoryphe) faunas indicate that faunal exchanges between peri-Gondwana, Laurentia and Baltoscandia may have begun much earlier than the late Katian when the Ordovician faunal provinces finally broke down.

      PubDate: Mon, 15 Jun 2015 15:13:04 GMT
       
  • Issue 45 - Furongian (late Cambrian) brachiopods and associated conodonts
           from the Takaka Terrane in the Springs Junction - Maruia area, South
           Island, New Zealand
    • Abstract: Percival, Ian G; Zhen, Yong Yi; Simes, John E; Cooper, Roger A
      The Sluice Box Formation, exposed in the Maruia - Lake Daniels - Springs Junction area at the southernmost extension of the Takaka Terrane west of the Alpine Fault in New Zealand's South Island, ranges in age from late Cambrian (early to middle Furongian) to Middle Ordovician (late Darriwilian). Linguliformean brachiopods described from Furongian exposures include 'Maruia castellum' new genus and species, and the new species Mirilingula antipodes and 'Akmolina'? 'tubulus', associated with 'Broeggeria' sp., 'Experilingula' sp., 'Notiobolus'? sp. and an unnamed new species of 'Quadrisonia'. The linguliformean brachiopods show strong biogeographic affinities to Kazakhstan, specifically the Malyi Karatau region. Conodonts from the lower Sluice Box Formation are assigned to the 'Furnishina quadrata - Prooneotodus muelleri' assemblage, 'Cordylodus proavus' assemblage, and the Juanognathus variabilis - 'Bergstroemognathus extensus' assemblage. These are respectively of early to middle Furongian (Paibian to Jiangshanian) age, basal Datsonian (equivalent to the middle of the unnamed Stage 10 of latest Cambrian age), and early Floian (Early Ordovician) age.

      PubDate: Mon, 7 Jul 2014 15:30:36 GMT
       
  • Issue 45 - The early middle Cambrian agnostid 'Pentagnostus praecurrens'
           (Westergard 1936) from Sweden
    • Abstract: Weidner, Thomas; Ebbestad, Jan Ove R.
      New material from autochthonous and allochthonous strata in Jamtland and southern Lapland of the agnostid species Pentagnostus praecurrens (Westergard 1936) is analysed. In Scandinavian biostratigraphy, 'P. praecurrens' is the index species of the lower middle Cambrian 'Acadoparadoxides pinus - Pentagnostus praecurrens' Zone of the 'Baltoparadoxides oelandicus' Superzone. Apart from the holotype cephalon and one aberrant complete specimen, only three detached cephala and six pygidia were previously illustrated. Their association was ambiguous and five of eleven specimens were recently re-assigned to other genera. New complete specimens in the present study enable a clear assignment of cephala to pygidia. Length-width measurements combined with a multivariate analysis of cephala were used to quantify the relationship of the new material and the results are discussed. The thorax is described for the first time. More than 100 specimens allow a clear appreciation of the morphological variation of the species and comparison to populations in other regions. Occurrence in Scandinavia is restricted to the 'Acadoparadoxides pinus - Pentagnostus praecurrens' Zone of Sweden. Occurrence in the younger 'T. gibbus' Zone of Sweden is doubtful. Outside Sweden the species occurs in the 'P. praecurrens' Zone in England, Canada and Australia. In Russia, P. praecurrens has a range from the 'P. praecurrens' Zone to the 'T. gibbus' Zone and may range even into the lower part of the 'Acidusus atavus' Zone.

      PubDate: Mon, 7 Jul 2014 15:17:06 GMT
       
  • Issue 45 - Middle Cambrian brachiopods from the Southern Georgina basin of
           central Australia
    • Abstract: Percival, Ian G; Kruse, Peter D
      Middle Cambrian brachiopod faunas, dominated by lingulates (linguloids, acrotheloids and acrotretoids) with a minor paterinate component, are documented from the southern Georgina Basin in the Northern Territory. They derive from two lithostratigraphic units: the Thorntonia Limestone of depositional sequence 1 (Ordian age), and the disconformably overlying Arthur Creek Formation, spanning uppermost sequence1 and all of depositional sequence 2 (latest Ordian to at least Boomerangian age in terms of the Australian stage scale). Apart from one outcrop locality, all specimens were obtained from limestone and dolostone intersected in core from thirteen drillholes. New species described are Aksarinaia subtilicrusta,? 'Chakassilingula undulata, Karathele quadrituberculum, Kostjubella robusta, Neotreta circularis, Picnotreta leptorhachis, Micromitra georginaensis' and an unnamed new species of 'Anabolotreta'. 'Kostjubella djagoran' (Kruse 1990) is a new combination. Also documented are 'Kyrshabaktella mudedirri' Kruse 1990, 'Westonia nyapungensis' Kruse 1990, 'Amictocracens teres' Henderson and MacKinnon 1981, 'Stilpnotreta' magna Henderson and MacKinnon 1981 and 'Treptotreta jucunda' Henderson and MacKinnon 1981, all of which have previously been recognised in contemporaneous formations from central and northern Australia, western New South Wales, Victoria and New Zealand. Several other forms referable to 'Kyrshabaktella',?'Orbithele',? 'Linnarssonia',? 'Treptotreta',? 'Batenevotreta',? Dictyonina and Micromitra are described without formal species assignment.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - The early Ordovician (Floian) bathyurid trilobite genera
           'Jeffersonia, Cullisonia' and 'Bathyurina'
    • Abstract: Adrain, Jonathan M; Karim, Talia S; Westrop, Stephen R
      Pioneering work by Christian Poulsen on Early Ordovician Laurentian faunas from Greenland established several genera which have been used often in the literature. Poulsen's original material has not previously been fully revised, and the content and identity of some genera have depended upon interpretations of his tiny photographs. We revise the type material of the type species of 'Bathyurina' Poulsen and 'Jeffersonia' Poulsen and argue that previous interpretations of their morphology and ideas about potentially related species are not well supported. 'Jeffersonia' has been used for a group of species with distinctive pygidial morphology. New photographs of the lectotype pygidium of the type species, 'J. exterminata' Poulsen, demonstrate that it lacks this morphology. 'Jeffersonia' is restricted to its type species, which is known from a single illustrated pygidium. Other species previously assigned to the genus are transferred to 'Cullisonia' Loch. New photographs of the two known cranidia of 'B. megalops' show that they are not closely similar to those of C. timon (Billings), as has previously been suggested, but rather to those of 'Goniotelina'? 'plicolabeonus' Young, from western Utah, which is revised on the basis of new collections and reassigned to 'Bathyurina'. New species from the Fillmore Formation of western Utah are: 'Bathyurina curtisi' (Carolinites nevadensis Zone), B. sumneri ('Presbynileus ibexensis' Zone), B. hooki (currently unzoned interval above 'P. ibexensis' Zone), 'B. morrisi' ('Psalikilus spinosum' Zone), and 'B.' sp. nov. A ('Psalikilus pikum' Zone).

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - Middle Cambrian (Series 3) arthropods (trilobita, Agnostida)
           from CRA exploration Scarr 1 drillhole, central Georgina basin, Northern
           Territory
    • Abstract: Laurie, John R
      Samples obtained from the CRA Exploration Scarr 1 drillhole contain several species of agnostoid arthropods and trilobites. These include? Criotypus sp., 'Acadagnostus' australis (Robison), Euagnostus sp.,? 'Onymagnostus' sp., Opsidiscus sp., Lyriaspis sp. and an indeterminate polymerid, indicating a probable age of late Floran 'Euagnostus opimus' Zone (Cambrian Series 3, Drumian) for the sampled interval of the Arthur Creek Formation. This indicates that the top of the lower unit of the Arthur Creek Formation in this area, as well as the top of the 'hot shale' (the thin basal unit of the lower Arthur Creek Formation) are both 'E. opimus' Zone in age.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - A Cambrian series 3 (Guzhangian) trilobite fauna with
           'Centropleura' from Christmas Hills, Northwestern Tasmania
    • Abstract: Bentley, Christopher J; Jago, James B
      A Cambrian Series 3 ('Guzhangian, Lejopyge laevigata' I Zone or 'L. laevigata' II Zone) trilobite fauna is described from Christmas Hills, northwestern Tasmania. Eleven polymerid taxa are described including the new species 'Asthenopsis conandersoni'. The genera 'Asthenopsis' and 'Elyx' are described for the first time from Tasmania. The nine agnostoid taxa include the cosmopolitan species 'Lejopyge laevigata, Acidusus aculeatus' and 'Hypagnostus brevifrons'. Cladistic analysis indicates that the Centropleuridae ('Centropleura, Luhops, Clarella and Anopolenus') form part of the Paradoxidoidea, where they are more closely related to the Xystriduridae ('Xystridura and Galahetes') than they are to the Paradoxididae ('Paradoxides, Hydrocephalus', 'Mawddachites' and 'Eccaparadoxides') and that the Ellipsocephalidae (Bergeroniellus and Lermontovia) are not part of the superfamily. The fossils occur within a deeply weathered laminated mudstone which, when fresh, was probably black and calcareous and deposited in an outer shelf setting.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - Brachiopods associated with stromatoporoid mounds from the
           middle to upper Ordovician Cashions Creek Limestone, Tasmania
    • Abstract: Jakobsen, Kristian G; Brock, Glenn A; Nielsen, Arne T; Mathieson, David K; Harper, David AT
      Stromatoporoid mounds and inter-mound carbonates in the upper part of the Darriwilian to Sandbian (Middle - Upper Ordovician) Cashions Creek Limestone in the Florentine Valley, southwest-central Tasmania were sampled in order to document the benthic macrofauna and investigate whether the stromatoporoid mounds had a higher brachiopod biodiversity. The brachiopod assemblage is characterised by 'Lepidomena' with a relative abundance of about 55% of the fauna. 'Lepidomena fortimuscula' and 'Lepidomena pulchra' represent the key brachiopod species. The brachiopod diversity recorded is higher in the inter-mound than on the mound. Other macrofossil groups, including bivalves, rostroconchs, cephalopods, bryozoans, gastropods and echinoderms are characterised by low diversity. Gastropods and brachiopods are the main encrusting organisms on the mounds, with encrusting bivalves and rostroconchs a minor component. The fauna is interpreted to have existed in a shallow marine, high energy depositional environment.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - New bradoriid arthropods from the giles creek dolostone
           (cambrian series 3, stage 5; templetonian), amadeus basin, central
           Australia
    • Abstract: Smith, Patrick M; Brock, Glenn A; Paterson, John R; Topper, Timothy P
      A new assemblage of bradoriids is reported from the Giles Creek Dolostone (Cambrian Series 3, Stage 5; Templetonian) in the Ross River Gorge area, NE Amadeus Basin, central Australia. One new genus and four new species are described: 'Annge iperte' gen. et sp. nov., 'Flemingopsis anteriospinata' sp. nov., 'Monasterium ferox' sp. nov. and 'Mongolitubulus tunpere' sp. nov. Only 'M. tunpere' sp. nov. may have been described previously from adjacent basins. This study provides the first systematic description of a Cambrian bradoriid assemblage from the Amadeus Basin.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - The early Ordovician (late Tremadocian; Stairsian) dimeropygid
           trilobite 'Pseudohystricurus' Ross
    • Abstract: Adrain, Jonathan M; Karim, Talia S; Westrop, Stephen R
      The Early Ordovician genus 'Pseudohystricurus' Ross has been treated as a minor taxonomic wastebasket for poorly known species featuring small, dorsally convex cranidia and tuberculate sculpture. No previously assigned species apart from the type species appear to belong to the genus. The type species, 'P. obesus' Ross, has been known in its type area from only a single cranidium. New collections demonstrate that it is confined to the recently proposed 'P. obesus' Zone, the uppermost trilobite zone of the Stairsian Stage. The species is revised on the basis of new collections from the type locality in the Garden City Formation, southeastern Idaho, and from the Fillmore Formation, western Utah. The genus is known from the underlying 'Pseudoclelandia cornupsittaca' Zone from a species described in open nomenclature from the Fillmore Formation. The oldest known species is 'P. wigglesorum' sp. nov., from the 'Bearriverops alsacharovi' Zone of the Garden City Formation. Details of developmental morphology revealed by silicified specimens offer compelling evidence that 'Pseudohystricurus' is closely related to the Middle - Late Ordovician 'Dimeropyge Opik'.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - Trilobite biostratigraphy of the Stairsian Stage (upper
           Tremadocian) of the Ibexian Series, Lower Ordovician, western United
           States
    • Abstract: Adrain, Jonathan M; Westrop, Stephen R; Karim, Talia S; Landing, Ed
      New field collections from sections in western Utah and southeastern Idaho permit the development of a high resolution trilobite biostratigraphy for the northern Laurentian Lower Ordovician (upper Tremadocian) Stairsian Stage similar to that proposed previously for the overlying Tulean and Blackhillsian stages. Four zones recognised previously are replaced with 11 formally proposed zones, most of which are new in concept. The new zonal scheme in ascending order includes the 'Paraplethopeltis genacurva' Zone (replaces 'Paraplethopeltis Zone'/'Zone C'), 'Paraplethopeltis helli' Zone (new), 'Hystricurus zanderi' Zone (new), 'Rossaspis leboni' Zone (new), Unnamed Zone 1 (new), 'Bearriverops loganensis' Zone (new; contains much of the diversity previously assigned to 'Tesselacauda Zone'/'Zone E'), 'Bearriverops deltaensis' Zone (new), 'Bearriverops alsacharovi' Zone (new), 'Pseudoclelandia weymouthae' Zone (new), 'Pseudoclelandia cornupsittaca' Zone (new) and 'Pseudohystricurus obesus' Zone (new). The latter two zones were previously lumped as the 'Rossaspis superciliosa Zone'/'Zone F'. Four of the name bearers of the new zones, 'Paraplethopeltis helli' sp. nov., 'Hystricurus zanderi' sp. nov., 'Rossaspis leboni' sp. nov. and 'Pseudoclelandia weymouthae' sp. nov., are formally described.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - The early evolution of middle - Late Ordovician rhynchonellide
           brachiopods in Laurentia
    • Abstract: Sproat, Colin D; Sohrabi, Akbar; Jin, Jisuo
      The evolution of the 'Rostricellula-Rhynchotrema-Hiscobeccus' lineage can be traced from late Sandbian to Llandovery times. The genera are similar, but can be differentiated based on several key features. 'Rhynchotrema' and 'Hiscobeccus' typically have four ribs on the fold and three in the sulcus whereas these numbers are variable in 'Rostricellula' Strong growth lamellae are rare in 'Rostricellula', well developed near the shell periphery in 'Rhynchotrema', but cover the anterior two thirds or more of the shell in 'Hiscobeccus. Rostricellula' lacks a cardinal process, while 'Rhynchotrema' and 'Hiscobeccus' possess a clearly defined cardinal process. 'Rhynchotrema ainsliei' may represent an intermediate form, as immature forms of the species may develop a cardinal process that is lost in adults. 'Hiscobeccus arcticus' is redefined based on the type material. The internal morphologies of 'Rhynchotrema ainsliei, Rhynchotrema wisconsinense' and 'Rostricellula orientalis' are described in detail from serial sections for the first time.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - The missisquoiid trilobite 'Parakoldinioidia' Endo 1937 in the
           uppermost Cambrian of Oklahoma and Texas, and its biostratigraphic
           significance
    • Abstract: Westrop, Stephen R; Adrain, Jonathan M
      Missisquoiid trilobites are widespread in Laurentian North America but most occurrences have been reported under a single name, 'Missisquoia typicalis' Shaw 1951 (now = 'Parakoldinioidia stitti' Fortey 1983). The base of the 'Parakoldinioidia' Zone (= 'Missisquoia typicalis' Subzone of older publications) is usually defined by the first appearance of the eponymous genus. In central Texas, the type area of the zone, three species have been recorded, and only one species is reported from correlative strata in Oklahoma. Restudy of archival collections from southern Oklahoma made by J.H. Stitt, as well as type and figured material from Texas and western Canada, revealed unexpected diversity of missisquoiid species. Our revision shows that there are at minimum ten species of 'Parakoldinioidia' and three species of 'Lunacrania' recorded in the uppermost Furongian successions of the southern Midcontinent and the southern Canadian Rocky Mountains. This indicates that Missisquoiidae underwent a significant radiation following the extinction interval at the base of the 'Eurekia apopsis' Zone. It also demonstrates the potential for a high-resolution species based zonation of at least regional utility. New species are 'Parakoldinioidia akerfeldti', 'P. lindgreni', 'P. mendezi', 'P. lopezi' and 'P. akessoni'; three additional new species are placed in open nomenclature.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - The mid Cambrian (Guzhangian; Marjuman) trilobite genus
           'Catillicephala' Raymond 1938 (Catillicephalidae) from the Cow Head Group
           and correlatives in eastern Canada
    • Abstract: Westrop, Stephen R; Dengler, Alyce A
      Species of 'Catillicephala' Raymond, 1938 from eastern Canada are revised from restudy of types, including a number of previously unfigured specimens, from the Grosses-Roches Formation, Quebec, and undescribed material from the Shallow Bay Formation (Cow Head Group), western Newfoundland. In both regions, sclerites are from allochthonous, shelf-derived limestone boulders in deep water, debris flow conglomerates. Several species founded upon inadequate material from Vermont are considered to be nomina dubia, including the type species, 'C. ovoides' (Raymond), 'C. lata' (Raymond) and 'C. fowleri' Shaw; new species from eastern Canada are 'C. calva' and 'C. shawi'. Catillicephala impressa (Rasetti) occurs in both Quebec and Newfoundland, 'C. rotunda' (Rasetti) and 'C. calva' are known only from Quebec, whereas 'C. shawi' is from Newfoundland. From faunal associations in the Grosses-Roches - Metis-sur-Mer region of Quebec, and the Cow Head area of western Newfoundland, 'C. impressa', 'C. lata', and 'C. shawi' are approximately the same age and occur in boulders that correlate with the late Marjuman (Guzhangian) 'Crepicephalus' Zone of Laurentian North America. Catillicephala rotunda appears to be older than the other species, and likely occurs in boulders that correlate with the 'Cedaria' Zone.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - Exceptional trace fossil preservation and mixed layer
           development in Cambro-Ordovician siliciclastic strata
    • Abstract: Tarhan, Lidya G; Droser, Mary L; Hughes, Nigel C
      Instances of exceptional preservation - preservation of near-surface structures of high taphonomic fidelity, including bioglyphic detail - have been previously reported from Cambro-Ordovician trace fossil assemblages worldwide. However, it has hitherto been unknown to what extent this exceptional preservation characterises the Cambro-Ordovician record as a whole. Herein we present ichnological, sedimentological and taphonomic data collected from the Bell Island Group (Beach Formation) and Wabana Group (Powers Steps Formation, Scotia Formation, Grebes Nest Point Formation) of Canada and the Bynguano Formation of Australia, units selected as representative of Cambro-Ordovician marine shelfal settings. Additionally, data from outgroup (both lower and higher energy) facies were collected from the Barrancos Formation of Spain, the Juniata Formation of the eastern United States and the Pacoota Sandstone of Australia in order to assess the role of depositional environment in Cambro-Ordovician infaunal colonisation and exceptional preservation. The Bynguano, Beach, Powers Steps, Scotia and Grebes Nest Point formations are characterised by widespread exceptional preservation of shallow-tier ichnological assemblages and bioglyphic structures, implying formation and preservation in a cohesive substrate. In spite of the common density and complexity of trace fossil assemblages, ichnofabric is (and thus infaunal mixing was) only poorly to moderately well developed. Trace fossils are preserved as discrete structures both along bedding planes and in cross-section. Well mixed intervals are typically of limited spatial extent and composed of millimetre-scale structures resulting in limited disruption of macro-scale depositional fabrics. Bed-sole assemblages are cast onto the bases of thin (millimetre- to centimetre-scale) sandstone horizons or beds rather than penetrating through beds. Comparison with outgroup facies both confirms the limited extent of biogenic mixing across a range of Cambro-Ordovician marine settings and highlights the significance of heterolithic facies for exceptional preservation and recognition of shallow-tier assemblages.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - Northern Australian microbial-metazoan reefs after the
           mid-Cambrian mass extinction
    • Abstract: Kruse, Peter D; Reitner, Joachim R
      Following the collapse of the early Cambrian calcimicrobial-archaeocyathan reef consortium, metazoans played little part in reef construction through the latter half of the Cambrian and earliest Ordovician. This interval was dominated by microbial reefs. Nevertheless, exceptional metazoan-moderated reefs have been reported from peri-Gondwanan Iran and Laurentia, and more recently from North China. The metazoan participants in these reefs were primarily spiculate sponges, which increasingly participated in reef construction over time. Two northern Australian examples provide further documentation of metazoan-moderated reefs immediately following the early Cambrian reef collapse. In the Ranken Limestone of the Georgina Basin (probably late Drumian-early Guzhangian), reefs were constructed by a calcimicrobial consortium including 'Angulocellularia' and minor 'Taninia'; these encrusted a scaffold of the anthaspidellid spiculate sponge 'Rankenella', as well as other skeletal metazoans. Older, late stage4-early stage5-age thrombolite reefs in the Tindall Limestone of the Daly Basin were constructed dominantly by 'Kordephyton' together with accessory 'Renalcis' and 'Epiphyton'-group calcimicrobes. Metazoans are represented by the heteractinide sponges 'Jawonya' and 'Wagima', which were reef dwellers only. The rare occurrence of the anthaspidellid sponge 'Rankenella mors' (Gatehouse 1968) is the first report of this taxon from the Daly Basin. These early-middle Cambrian reef occurrences confirm the speculation that in the aftermath of the collapse of the early Cambrian reef consortium, siliceous sponges reoccupied the ecological niche formerly held by the archaeocyaths. New taxa described from these reefs are the lithistid demosponge 'Asterodesma megaspiculata' Reitner and Kruse gen. et sp. nov. and the calcimicrobial species 'Kordephyton australis' Kruse and Reitner sp. nov. and 'Taninia zebra' Kruse and Reitner sp. nov.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - Late Furongian trilobites from the Quebrada Oblicua, San Isidro
           area, Mendoza, Argentina
    • Abstract: Tortello, MFranco
      The trilobites from the 'Hungaia puelchana Zone' (=Saukia Zone) of the San Isidro area (Mendoza, western Argentina) were briefly described by Carlos Rusconi in the 1950s, and since then they have been cited frequently in the literature but not fully revised. Large numbers of specimens from late Cambrian allochthonous carbonate blocks (La Cruz Olistolith) of the Quebrada Oblicua are available in the Angel Borrello collections of the Museum of Natural Sciences of La Plata, Argentina. On the basis of this material, Micragnostus pehuenchensis (Rusconi), Hungaia puelchana Rusconi and Rasettia crucensis (Rusconi) are redescribed herein. In addition, Phoreotropis Raymond and Tatonaspis Kobayashi are reported from the Argentine Precordillera for the first time. The fauna studied has a clear Laurentian aspect and is assigned to the Upper Sunwaptan (upper Furongian).

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
  • Issue 45 - New Zealand Cambrian and Ordovician micromolluscs
    • Abstract: Pojeta, John; Simes, John E; Cooper, Roger A
      Micromolluscs from previously unreported collections of limestones in the early Palaeozoic Takaka Terrane of the western South Island of New Zealand belong to 20 taxa and are briefly described, figured and compared. They comprise pelagiellids, helcionelloids, bellerophontiform shells, gastropods, tryblidians, rostroconchs and pelecypods, and range from Drumian (middle Cambrian) to Sandbian (late Ordovician). Fourteen taxa are recorded from New Zealand for the first time, including: 'Pelagiella' sp.,? 'Yochelcionella' sp., 'Scenella' sp., open and advolute bellerophontiform species, dextral and sinistral gastropod species, an eopteriid, Ribeiria sp., and two groups of palaeotaxodont pelecypods.

      PubDate: Fri, 20 Jun 2014 08:35:03 GMT
       
 
 
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