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Journal Cover   Memoirs of the Association of Australasian Palaeontologists
  [SJR: 0.382]   [H-I: 4]   [2 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 0810-8889
   Published by RMIT Publishing Homepage  [407 journals]
  • 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. <br /><br /> 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. <br /><br /> 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 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, 28 Oct 2011 16:04:35 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 GMT
  • Issue 39 - Septal Architecture and Palaeoecology of 'Calceola' (Cnidaria,
           Calceolidae), with Comments on the Phylogeny of Devonian Operculate
    • 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 GMT
  • Issue 39 - Devonian Scolecodonts from the Tyrnaueralm, Graz Palaeozoic,
    • 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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 (<14 m) succession of extremely argillaceous carbonate mudstones and shales that are restricted to the central Arbuckle Mountain region in southern Oklahoma. Conodont faunas of the Kockelella crassa, Ancoradella ploeckensis and Polygnathoides siluricus zones indicate that the lower member ranges in age from the early Gorstian into the middle Ludfordian (Ludlow). Mudstone lithofacies, Dapsilodus conodont biofacies and presence of graptolites indicate relatively deep water, offshore deposition of the lower member. The variable thicknesses of the lower member, of units within it, and of conodont zones over short distances suggest that deposition was discontinuous and occurred on an irregular, shifting surface, such as may have existed along the northern edge of the failed-rift margin of the Southern Oklahoma Aulacogen. Values of [delta]13C and [delta]18O are relatively uniform through the lower member and resemble Ludlow isotopic curves from Lithuania and Podolia. Short-lived negative [delta]13C excursions at unit boundaries are attributed to diagenetic effects at discontinuity surfaces. The Baltic pattern of Gorstian-early Ludfordian oceanic episodes are difficult to recognise and no lithofacies, conodont faunal or carbon isotope evidence of the late Gorstian Linde Event was recovered. The thicker upper member of less argillaceous carbonate strata (up to 100 m) rests unconformably on the lower member and the unconformity coincides with the mid-Ludfordian Lau Event and carbon isotope excursion (CIE). The diverse shelly fauna of the Henryhouse Formation does not occur in the lower member, but is restricted to the upper member, which is late Ludfordian and Pridoli in age.

      PubDate: Fri, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 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, 1 Jul 2011 15:44:37 GMT
  • Issue 39 - Evolution and Environmental Adaptation of the Late Ordovician -
           Early Devonian Orthide Brachiopod 'Dicoelosia'
    • Abstract: Chen, Pengfei; Jin, Jisuo
      The small, variously bilobate shells of the brachiopod genus Dicoelosia have generally been considered as adaptations to relatively deep- and quiet-water environments (BA4 or deeper). Many species of Dicoelosia, however, invaded relatively shallow-water habitats intermittently throughout the geological range of the genus from Katian (Late Ordovician) to Lochkovian (Early Devonian) times. In this study, the relationship between morphological adaptations and living environments of different forms of Dicoelosia are investigated based on a global compilation of Dicoelosia species. Multivariate and other numerical analyses of 11 measurements from each of 92 selected specimens indicate several trends of morphological change in time and space: 1, the Late Ordovician species were predominantly wider than long, with strongly divergent lobes, whereas the later forms in the Silurian and Early Devonian developed more elongate shells with weakly divergent to subparallel lobes; 2, from the early Silurian to Early Devonian, the profile of individual lobes changed from concavo-convex to biconvex; 3, the deeper-water shells have proportionally longer and more slender lobes with a deeper anteromedial emargination than the shallower-water forms, especially during the Silurian. These morphological changes were likely related to an optimisation of the lophophore tissue volume versus the lophophore-water interface area along the lobe margin, which would have improved the efficiency of the lophophores for suspension filter feeding and gas exchange, especially in deep-water, oxygen-poor environments.

      PubDate: Fri, 1 Jul 2011 15:44:37 GMT
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