Subjects -> PALEONTOLOGY (Total: 46 journals)
Showing 1 - 21 of 21 Journals sorted alphabetically
Acta Palaeontologica Polonica     Open Access   (Followers: 6)
Alcheringa: An Australasian Journal of Palaeontology     Hybrid Journal   (Followers: 7)
Ameghiniana     Open Access   (Followers: 1)
Annales de Paléontologie     Full-text available via subscription   (Followers: 7)
Annals of Carnegie Museum     Full-text available via subscription   (Followers: 1)
Boreas: An International Journal of Quaternary Research     Hybrid Journal   (Followers: 12)
Comptes Rendus Palevol     Full-text available via subscription  
European Journal of Protistology     Hybrid Journal   (Followers: 6)
EvoDevo     Open Access   (Followers: 4)
Facies     Hybrid Journal   (Followers: 10)
Fossil Record     Open Access   (Followers: 5)
Geobios     Full-text available via subscription   (Followers: 6)
Historical Biology: An International Journal of Paleobiology     Hybrid Journal   (Followers: 9)
Ichnos: An International Journal for Plant and Animal Traces     Hybrid Journal  
International Journal of Speleology     Open Access   (Followers: 3)
Journal of Paleolimnology     Hybrid Journal   (Followers: 6)
Journal of Paleontology     Hybrid Journal   (Followers: 11)
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Journal of Vertebrate Paleontology     Full-text available via subscription   (Followers: 12)
Marine Micropaleontology     Hybrid Journal   (Followers: 2)
Micropaleontology     Full-text available via subscription  
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 4)
Novitates Paleoentomologicae     Open Access   (Followers: 1)
Open Quaternary     Open Access   (Followers: 1)
Palaeogeography, Palaeoclimatology, Palaeoecology     Hybrid Journal   (Followers: 13)
Palaeontology     Hybrid Journal   (Followers: 18)
Palaeoworld     Hybrid Journal   (Followers: 3)
PALAIOS     Hybrid Journal   (Followers: 7)
Paläontologische Zeitschrift     Hybrid Journal   (Followers: 4)
Paleobiology     Full-text available via subscription   (Followers: 6)
PaleoBios     Open Access   (Followers: 1)
Paleoceanography and Paleoclimatology     Full-text available via subscription   (Followers: 4)
Paleontological Journal     Full-text available via subscription   (Followers: 5)
Paleontological Research     Full-text available via subscription   (Followers: 3)
Palynology     Hybrid Journal   (Followers: 2)
Papers in Palaeontology     Hybrid Journal   (Followers: 1)
Quaternaire     Open Access   (Followers: 2)
Quaternary Research     Full-text available via subscription   (Followers: 20)
Quaternary Science Reviews     Hybrid Journal   (Followers: 25)
Review of Palaeobotany and Palynology     Hybrid Journal   (Followers: 2)
Revue de Micropaleontologie     Full-text available via subscription  
Rivista Italiana di Paleontologia e Stratigrafia (Research In Paleontology and Stratigraphy)     Open Access   (Followers: 2)
Spanish Journal of Palaeontology     Open Access  
Swiss Journal of Palaeontology     Hybrid Journal   (Followers: 4)
Vertebrate Anatomy Morphology Palaeontology     Open Access   (Followers: 2)
Zitteliana     Open Access   (Followers: 4)
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Geobios
Journal Prestige (SJR): 0.618
Citation Impact (citeScore): 1
Number of Followers: 6  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0016-6995 - ISSN (Online) 1777-5728
Published by Elsevier Homepage  [3293 journals]
  • Intraspecific variation of Eolophiodon laboriense, a basal Lophiodontidae
           (Mammalia, Perissodactyla) from the early Eocene of Southern France
    • Abstract: Publication date: Available online 20 February 2019Source: GeobiosAuthor(s): Quentin Vautrin, Rodolphe Tabuce, Yves Laurent, Dominique Vidalenc, Fabrice Lihoreau The Lophiodontidae is an emblematic and well-documented Eocene family of perissodactyls from Western Europe. However, after more than a century and a half of studies, lophiodontids still display a complex systematics associated with blurry intraspecific variation and a poorly known early radiation. The locality of La Borie, located near the city of Toulouse, France, has yielded numerous remains of Eolophiodon laboriense. This abundance of remains allows for the first time the study of the intraspecific variation of a basal lophiodontid. The variation has been investigated for dental and cranio-mandibular characters, notably dental polymorphism, size variation and sexual dimorphism. The intraspecific variation of E. laboriense is high with more than 20 polymorphic characters of the dentition, including many additional crests and conules. This dental polymorphism is similar to the one observed in the Bartonian lophiodontid Lophiodon lautricense. Eolophiodon laboriense also displays an important degree of sexual dimorphism, with male specimens having broader and longer mandibles with larger canines than females. Despite this high intraspecific variation, the low size variation of teeth and the consistency of diagnostic characters strengthen the validity of the genus Eolophiodon and does not impact the previous lophiodontid phylogeny.
       
  • The morphology and ultrastructure of Jurassic in situ ginkgoalean
           pollen
    • Abstract: Publication date: Available online 20 February 2019Source: GeobiosAuthor(s): Natalia Zavialova, Natalya Nosova A fragmentary pollen organ with four to six microsporangia is discovered from the Middle Jurassic of the Irkutsk coal basin, Siberia. The in situ pollen grains are boat-shaped, monosulcate, and with a nearly psilate surface. The non-aperture ectexine is composed of a thick solid tectum, a thin infratectum, and a thin foot layer. The infratectum includes one row of small rare alveolae. The supposedly poorly preserved endexine is thin and grainy. The ectexine reduces greatly in the aperture area, where only homogeneous ectexinal patches are present over the endexine. The pollen grains under study resemble in their exine ultrastructure pollen grains of the modern Ginkgo biloba and pollen grains from dispersed seeds of a presumably ginkgoalean affinity from the Middle Jurassic of Uzbekistan. This suggests that the ginkgoalean exine ultrastructure of the modern type existed as early as the Middle Jurassic. The exine ultrastructure under study is also similar, though to lesser degree, to that of dispersed pollen grains of a presumed ginkgoalean affinity from the Cretaceous of the Russian Far East. The diversity of such a long-living group as ginkgoaleans is apparently reflected in the diversity of their exine ultrastructure. To the present knowledge, ginkgoalean pollen grains can be differentiated from similar boat-shaped monosulcate pollens by the following co-occurring characters: a thick homogeneous tectum, a thin infratectum with one row of structural elements, a thin foot layer, and an ectexine that is reduced in the aperture region to patches.
       
  • Leonophyllum tenellum nov. gen., nov. sp., an enigmatic plant from the
           Early Jurassic of the Mecsek Mts (Hungary)
    • Abstract: Publication date: Available online 19 February 2019Source: GeobiosAuthor(s): Maria Barbacka, Grzegorz Pacyna, Artur Górecki, Evelyn Kustatscher The Early Jurassic flora of the Mecsek Mountains is diverse, with numerous representatives of ferns, seed ferns, cycadophytes, ginkgophytes, and conifers. Its (para-)autochthonous deposition, good preservation and low collection bias has permitted researchers to save delicate, small plant remains that would generally be missing from the fossil record. These plant fossils are characterized by having a “filmy” (probably unilayered) structure, thin stalks with flat leaf-like branches and ultimate irregular segments with streamlined epidermal cells having thick cell walls. Due to the absence of sporangia, the plant remains cannot be confidently assigned to any higher plant group, although they show some similarities to thalloid liverworts with raised vegetative bodies and also have some resemblance to the fern family Hymenophyllaceae. The new genus and species Leonophyllum tenellum Barbacka et Kustatscher is erected.
       
  • Biochronological framework for the late Galerian and early-middle Aurelian
           Mammal Ages of peninsular Italy
    • Abstract: Publication date: Available online 18 February 2019Source: GeobiosAuthor(s): C. Petronio, G. Di Stefano, T. Kotsakis, L. Salari, F. Marra, B.R. Jicha Following a recent chronostratigraphic revision of 17 fossiliferous sites hosting assemblages constituting local faunas of the Aurelian Mammal Age for peninsular Italy, we provide a re-structured biochronological framework and discuss the current validity and significance of the middle Pleistocene Faunal Units (FU) for this region. Contrasting with the previous model of a wide faunal renewal during Marine Isotope Stage (MIS) 9 (∼330 ka), the First Occurrences (FO) of several species of the Torre in Pietra FU are significantly backdated and referred to the Fontana Ranuccio FU (530-400 ka). We show that the faunal renewal was more gradual and occurred earlier than previously assumed. Many taxa that are typical of the late Pleistocene register their FO in the Fontana Ranuccio FU, latest Galerian, which is characterized by the almost total disappearance of Villafranchian taxa and by the persistence of typical Galerian taxa such as Dama clactoniana, Bison schoetensacki and Ursus deningeri, and by the FO of Stephanorhinus kirchbergensis, S. hemitoechus, Hippopotamus amphibius, Cervus elaphus eostepahnoceros, Ursus spelaeus, Canis lupus, and Vulpes vulpes. The next Torre in Pietra FU is characterized only by the FO of Megaloceros giganteus and Mustela putorius. However, we observe that MIS 9 marks the actual moment when the faunal assemblages of this region are represented only by those taxa characterizing the late middle Pleistocene and late Pleistocene. For this reason, we propose to still consider the Torre in Pietra (lower levels) local fauna as a conventional boundary for the Galerian-Aurelian transition. Finally, we remark that the strong faunal renewal in MIS 13, with six FOs, coincides with the temperate climatic conditions due to the absence of marked glacial periods that could have favored the FO and the subsequent spread of these taxa.
       
  • Chancelloriid sclerites from the lowermost Cambrian of North China and
           discussion of sclerite taxonomy
    • Abstract: Publication date: Available online 18 February 2019Source: GeobiosAuthor(s): Hao Yun, Xingliang Zhang, Luoyang Li, Bing Pan, Guoxiang Li, Glenn A. Brock Chancelloriid sclerites from the lowermost Cambrian Xinji Formation (Series 2, Stage 3), southern margin of the North China platform, are systematically described. Thousands of isolated sclerites from three sections are assigned to three genera and four species, including Chancelloria cf. eros, Allonnia tripodophora, Archiasterella pentactina, and Ar. tetraspina. To accurately document the taxonomic significance of the sclerite structure, modified formulas (m+nC, m+nA, and m+0) are put forward to represent the full series and variation of sclerite forms. Based on the sclerite construction, statistical analysis on the proportions of different sclerite forms in the rock samples and the composition of sclerites in previously described chancelloriid scleritomes, a new scheme for identification and classification of isolated sclerites reconciled within the framework of the complete scleritome, is proposed.
       
  • First giraffid skulls (Bohlinia attica) from the late Miocene Maragheh
           fauna, Northwest Iran
    • Abstract: Publication date: Available online 18 February 2019Source: GeobiosAuthor(s): Elnaz Parizad, Majid Mirzaie Ataabadi, Marjan Mashkour, Nikos Solounias An almost complete skull and a second partial skull of Bohlinia attica (Artiodactyla: Giraffidae) from the late Miocene of Maragheh in northwestern Iran is described along with a complete upper dentition from Samos in Greece. These specimens enrich what is known of this species. The skull has massive bent ossicones. The braincase is horizontal to the face in lateral view. The upper premolars have strongly curved styles. The metapodials of this species are elongate with a deep plantar trough. The braincase is short and the occipital does not extend caudally. The type material of Bohlinia is from Pikermi but this taxon is also known from localities in F.Y.R.O. Macedonia, Greece, Turkey, Bulgaria, Iraq, and Iran. The new specimens are similar to others except that the ossicone terminates in a knob and the palatine choanae are positioned caudally. This taxon along with Honanotherium, which is most similar but with shorter metapodials and simpler premolars, can be placed in the subfamily Bohlininae.
       
  • Postcranial anatomy of Riograndia guaibensis (Cynodontia: Ictidosauria)
    • Abstract: Publication date: Available online 18 February 2019Source: GeobiosAuthor(s): Morgan L. Guignard, Agustin G. Martinelli, Marina B. Soares Postcranial remains of non-mammaliaform cynodonts provide crucial information documenting the anatomical steps and locomotor advances that led to the mammalian pattern. Here, we present a detailed description of the first postcranial specimens referable to Riograndia guaibensis (Probainognathia, Ictidosauria), an abundant non-mammaliaform cynodont from the Late Triassic of Brazil (Riograndia Assemblage Zone, Candelária Sequence) that is closely related to Mammaliaformes. Functional and ecological implications of these fossils are also investigated, based on scapular and humeral morphology and muscular reconstructions. The pectoral girdle and forelimb show fossorial adaptations, with numerous specializations increasing the mechanical advantages of retractor muscles. Riograndia guaibensis retained a semi-sprawling forelimb, with well-developed adductor muscles to hold the body off the ground. These results confirm that the forelimb posture of non-mammaliaform probainognathians was still similar to that of basal synapsids and differed from the more erect posture and parasagittal function of therians.
       
  • Reading paleoenvironmental information from Middle Jurassic ginkgoalean
           fossils in the Yaojie and Baojishan basins, Gansu Province, China
    • Abstract: Publication date: February 2019Source: Geobios, Volume 52Author(s): Li Zhang, Tao Yang, Wen-Jia Li, Jing-Wei Jia, Xue-Song Mou, Ying-Quan Chen, San-Ping Xie, Jun-Jie Fan, De-Fei Yan A new method for reconstructing paleoenvironments using the pavement cell characteristics of Middle Jurassic ginkgoalean fossils from the Yaojie and Baojishan basins, Gansu Province, China, is presented. Specifically, we use present-day relationships between the length-to-width (L/W) ratio of leaf pavement cells of Ginkgo biloba and mean annual temperature (MAT), mean annual precipitation (MAP), and relative humidity (RH). Primary analyses indicate that the L/W ratio of Ginkgo biloba pavement cells is negatively correlated with MAT, MAP, and RH, and linear regression equations can be established. Based on these equations, paleoclimatic parameters were inferred using the ginkgoalean fossil data. The estimated paleotemperatures in the Yaojie and Baojishan basins during the Middle Jurassic are approximately 6 °C higher than those of the present day, which is consistent with the results of the currently used stomata ratio method and the global CO2 prediction model. We deduce that paleoprecipitation in the basins was approximately 460 mm higher and paleohumidity approximately 20% higher than current conditions and thus the two basins exhibited humid subtropical conditions during the Middle Jurassic. Fossil flora and spore-pollen assemblage data from the study areas corroborate the new observations.
       
  • The Madenli (Central Taurides) Upper Cretaceous platform carbonate
           succession: Benthic foraminiferal biostratigraphy and platform evolution
    • Abstract: Publication date: February 2019Source: Geobios, Volume 52Author(s): Cemile Solak, Kemal Taslı, Sacit Özer, Hayati Koç The Upper Cretaceous succession in the Madenli area (western Central Taurides, Southern Turkey) consists of platform carbonate rocks deposited in entirely peritidal environments, which are sensitive to sea level changes driven by global eustasy, but also strongly affected by local and regional tectonics. It includes economically important bauxite deposits. Previous works suggest different ages for bauxite formation ranging from the Albian to the Santonian. Benthic foraminiferal biostratigraphy and facies analysis of the Madenli and Doğankuzu outcrop sections allow for a more precise dating of the platform emersion periods. The footwall limestones of the bauxite deposits consist of well-bedded limestones (Unit-1), which contain a benthic foraminiferal assemblage (BFA) including mainly Biconcava bentori and Pastrikella biplana, Chrysalidina gradata (BFA I), assigned to the middle-upper Cenomanian. In the Madenli section, the first bauxite deposit occurs in the upper part of Unit-1 as a layer interbedded with pinkish sparitic and dolomitic beds (subunit-1a) deposited in supratidal environment. Subunit-1a is stratigraphically equivalent to the Doğankuzu and Mortaş bauxite deposits considered as karst-related, unconformity-type deposits. The hanging-wall limestones of the bauxite are represented by the massive limestones (Unit-2) starting locally with either the upper Cenomanian characterized mainly by the presence of Pseudolituonella reicheli or upper Campanian comprising mainly Murciella cuvillieri and Moncharmontia apenninica (BFA II). There is no field evidence of a discontinuity surface at the contact between the lower part of Unit-2, including BFA I, and the upper part of Unit-2, including BFA II. This contact is defined as a paraconformity indicating a stratigraphic gap from the Turonian to the early Campanian. The top of Unit-2 is truncated by another discontinuity surface associated with a minor bauxite deposit. The overlying Unit-3 is characterized by well-bedded, rudist-bearing limestones topped by laminated and dolomitized limestones organized in shallowing upward cycles. It is assigned to the upper Maastrichtian based on the presence of Rhapydionina liburnica (BFA III) and rudist assemblage. A third emersion period of the platform corresponds to the early Maastrichtian.
       
  • Reappraisal of some Upper Devonian (Famennian) spiriferide brachiopods
           from the Band-e Bayan Domain (Afghanistan)
    • Abstract: Publication date: February 2019Source: Geobios, Volume 52Author(s): Bernard Mottequin, Denise Brice The upper and uppermost Famennian succession (Upper Devonian) of the Band-e Bayan Domain (also known as the Axial Zone), a Cimmerian terrane of western Afghanistan (northern margin of Gondwana), yielded diverse brachiopod faunas that are dominated by the spiriferides. Among the latter, six species belonging to four genera, previously erected by D. Brice in the seventies and also known from Iran, are reappraised on the basis of their type material and re-illustrated. The genera Enchondrospirifer and Eobrachythyris are transferred to the subfamilies Cyrtospiriferinae (Cyrtospiriferoidea) and Prospirinae (Spiriferoidea), respectively, whereas the ornament and micro-ornament of both Afghan species of Dichospirifer are documented. The genus Ghorispirifer nov. gen. (Cyrtiopsinae) is erected with Cyrtiopsis graciosa chakhaensis Brice as type species, and includes a second species, namely Cyrtiopsis lapparenti Brice. The new genus is characterized notably by the strong development of ventral apical callosities. Upper Devonian (Frasnian') brachiopods from the Band-e Bayan Domain described by Maillieux in the first half of the 20th century are revised and photographically illustrated for the first time. The brachiopod generic diversity recognized in Afghanistan (Band-e Bayan Domain, Central Mountains) prior to the Hangenberg Crisis is very high in some sections of the Band-e Bayan Domain (Rhuk pass section, and to a lesser extent at Robat-e-Pai), as also observed in contemporaneous successions of South China and contrary to what is reported in Western Europe (Franco-Belgian Basin for instance).
       
  • Stable deep-sea macrobenthic trace maker associations in disturbed
           environments from the Eocene Lefkara Formation, Cyprus
    • Abstract: Publication date: February 2019Source: Geobios, Volume 52Author(s): Olmo Miguez-Salas, Francisco J. Rodríguez-Tovar Ichnological analysis of Eocene deep-pelagic whitish chalky calcilutites interstratified with high-energy calcarenite beds in the lower part of the Petra Tou Romiou section (southern Cyprus) was conducted to interpret the development and evolution of the trace maker associations during calcilutite deposition after high-energy episodes. The trace fossil assemblage from the chalky calcilutites consists of Chondrites isp. (Chondrites intricatus and Chondrites targionii), Planolites isp., Taenidium isp., Thalassinoides isp., and Zoophycos isp., typical of the Zoophycos ichnofacies. A composite chalky ichnofabric reveals a multi-tiered association of burrowing animals: the uppermost tier determines a mottled background, the upper tier shows the highest trace fossil abundance and diversity (Planolites, Taenidium and Thalassinoides), the middle tier features Zoophycos and large Chondrites, and the deepest tier consists mainly/exclusively of small Chondrites. This ichnofabric has an autocomposite character, associated with bioturbation by a single ichnocoenosis and gradual upward migration of the tiered macrobenthic community as the pelagic calcilutite sedimentation slowly progresses. There are no changes in the trace fossil assemblage between or within calcilutite intervals, regardless of the associated calcarenite beds. This supports a stable, mature, background calcilutite trace maker association, which recovers shortly after the deposition of high-energy calcarenites. In turn, there would have been a rapid re-establishment of paleoenvironmental conditions during pelagic calcilutite accumulation after episodic deposition of any calcarenitic material.
       
  • Exceptionally preserved soft parts in fossils from the Lower Ordovician of
           Morocco clarify stylophoran affinities within basal deuterostomes
    • Abstract: Publication date: February 2019Source: Geobios, Volume 52Author(s): Bertrand Lefebvre, Thomas E. Guensburg, Emmanuel L.O. Martin, Rich Mooi, Elise Nardin, Martina Nohejlová, Farid Saleh, Khaoula Kouraïss, Khadija El Hariri, Bruno David The extinct echinoderm clade Stylophora consists of some of the strangest known deuterostomes. Stylophorans are known from complete, fully articulated skeletal remains from the middle Cambrian to the Pennsylvanian, but remain difficult to interpret. Their bizarre morphology, with a single appendage extending from a main body, has spawned vigorous debate over the phylogenetic significance of stylophorans, which were long considered modified but bona fide echinoderms with a feeding appendage. More recent interpretation of this appendage as a posterior “tail-like” structure has literally turned the animal back to front, leading to consideration of stylophorans as ancestral chordates, or as hemichordate-like, early echinoderms. Until now, the data feeding the debate have been restricted to evaluations of skeletal anatomy. Here, we apply novel elemental mapping technologies to describe, for the first time, soft tissue traces in stylophorans in conjunction with skeletal molds. The single stylophoran appendage contains a longitudinal canal with perpendicular, elongate extensions projecting beyond hinged biserial plates. This pattern of soft tissues compares most favorably with the hydrocoel, including a water vascular canal and tube feet found in all typical echinoderms. Presence of both calcite stereom and now, an apparent water vascular system, supports echinoderm and not hemichordate-like affinities.
       
  • Sclerospiroxylon xinjiangensis nov. sp., a gymnospermous wood from the
           Kungurian (lower Permian) southern Bogda Mountains, northwestern China:
           Systematics and palaeoecology
    • Abstract: Publication date: February 2019Source: Geobios, Volume 52Author(s): Mingli Wan, Wan Yang, Jun Wang A new silicified wood, Sclerospiroxylon xinjiangensis Wan, Yang et Wang nov. sp., is described from the Cisuralian (lower Permian) Hongyanchi Formation in southeast Tarlong section, Turpan City, Xinjiang Uygur Autonomous Region, northwestern China. The fossil wood is composed of pith, primary xylem and Prototaxoxylon-type secondary xylem. The pith is solid, circular, heterocellular, with sclerenchyma and parenchyma. The primary xylem is endarch to mesarch, with scalariform thickenings on tracheid walls. The secondary xylem is pycnoxylic, composed of tracheids and parenchymatous rays. Growth rings are distinct. Tracheids have mostly uniseriate, partially biseriate araucarian pitting on their radial walls. Helical thickenings are always present on both the radial and the tangential walls. Rays are 2–14 cells high, with smooth walls. There are 2 to 7, commonly 2 to 4 cupressoid pits in each cross-field. Leaf traces suggest that S. xinjiangensis nov. sp. was evergreen with a leaf retention time of at least 15 years. Based on the sedimentological evidence, growth rings within the S. xinjiangensis nov. sp. could have been caused by seasonal climatic variations, with unfavorable seasons of drought or low temperature. Low percentage of latewood in each growth ring is probably due to the intensity of climatic seasonality and/or long leaf longevity.
       
  • Late Moscovian (mid-Pennsylvanian) rugose corals from Wadi Araba (Egypt,
           Eastern Desert): Taxonomy, palaeoecology and palaeobiogeography
    • Abstract: Publication date: February 2019Source: Geobios, Volume 52Author(s): Mahmoud Kora, Hans-Georg Herbig, Heba El Desouky An important late Moscovian rugose coral association is described from the Rod El Hamal Formation of the Wadi Araba area (northern Eastern Desert, Egypt). The upper part of the formation yielded a moderately abundant but poorly diversified coral fauna composed of large dissepimented solitary rugose corals. In total, six species belong to the Bothrophyllidae and the Geyerophyllidae, including three new species: Bothrophyllum suezensis, Bothrophyllum cylindricum, and Amygdalophylloides omarai. Three undeterminable Bothrophyllidae taxa are left in open nomenclature. The corals were attached to the soft substrate by talons and rootlets, either rooted and growing upward as mud-stickers or as secondary recliners. They show frequent rejuvenations and constrictions. Encrustation and/or bioerosion are scarce. Carbonate microfacies indicate a habitat in littoral and inner neritic zones adjacent to a low terrigenous hinterland. Colonial taxa are missing and tabulate corals are rare. The corals from the Rod El Hamal Formation are the only example of a late Moscovian coral fauna on the southern margin of the Palaeotethys, that is to say along the northern margin of Gondwana. The association shows similarities with northwestern Spain (Cantabrian Mountains), the Donets and Moscow basins, and thus a general attribution to the Palaeotethys realm.
       
  • First palynological data from the Jurassic South Xiangshan Formation
           (Nanjing area, China)
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Artai A. Santos, Xin Wang, Qiang Fu, José B. Diez The outcrops of the Xiangshan Group have been studied since the beginning of the twentieth century, yielding a rich macroflora (the Xiangshan Flora), mainly from the lower part of the Xiangshan Group (South Xiangshan Formation). Nevertheless, no palynological data have been published so far from the South Xiangshan Formation. The present study provides the first palynostratigraphic data of the South Xiangshan Formation. More than 50 fossil taxa from 30 fossil genera have been identified, allowing for a more accurate dating. The most characteristic taxa are Polycingulatisporites triangularis, Quadraeculina anellaeformis, Manumia delcourtii, Ischyosporites variegatus, Callialasporites turbatus, C. trilobatus, C. minus, and Sestrosporites pseudoalveolatus, suggesting a late Toarcian-late Aalenian age for the South Xiangshan Formation. These results are consistent with previous studies suggesting a middle-late Early Jurassic age for this formation; consequently, the most probable age for the South Xiangshan Formation is late Toarcian (late Early Jurassic).
       
  • Stratigraphy and palynology of the Pennsylvanian continental Buçaco
           Basin (NW Iberia)
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Gil Machado, Milada Vavrdová, Madalena Fonseca, Paulo Emanuel Fonseca, Fernando Rocha The Buçaco Basin is a Pennsylvanian continental basin located along an important NNW–SSE strike structure (Porto-Tomar-Ferreira do Alentejo shear zone) that separates the Ossa-Morena and Central Iberian Zones of the Iberian Variscan Fold Belt in central western Portugal. The shear zone controlled the sedimentation in the basin and probably its post-sedimentary evolution. Sedimentation is initially alluvial with characteristic red sandstones, breccias and conglomerates. A gradual change to a fluvial (and probably lacustrine) type of sedimentation is observed with finning-upward cycles of gravel conglomerates, sandstones and organic-rich mudstones with occasional coal seams. Three representative sections were sampled for palynology and seventeen samples yielded sporomorphs with moderate to poor preservation. The palynological content from the alluvial sediments shows low diversity and poorly preserved assemblages dominated by Triquitrites spp., Densosporites spp., Laevigatosporites spp., and other taxa associated with siliciclastic environments or rheophytic mires. The fluvial and lacustrine sediments show a dramatic increase in diversity with an abundant, typical peatland microflora including sporomorphs such as Endosporites spp., Lycospora spp. and Monoletes spp., but also marginal peat and siliciclastic substrate taxa such as Densosporites spp., Latensina/Cordaitina spp., and Florinites spp. Other common taxa are Cheiledonites spp., Crassispora spp., Dictyotriletes-like miospores (mostly fragments), Potonieisporites spp., and Wilsonites spp. The presence and considerable abundance of Potonieisporites novicus and Cheiledonites cf. major is indicative of the middle to upper Potonieisporites novicus-bhardwajii–Cheiledonites major (NBM) miospore biozone of Western Europe, corresponding to the late Stephanian (early Gzhelian).
       
  • Foreword for the thematic issue of the First Workshop on Iberian
           Palaeobotany and Palynology
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Borja Cascales-Miñana, José B. Diez
       
  • New sedimentological and palynological data from the Permian and Triassic
           series of the Sancerre-Couy core, Paris Basin, France
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Manuel A. Juncal, Sylvie Bourquin, Laurent Beccaletto, José B. Diez A new description and sampling campaign of the Sancerre-Couy core has been achieved to reconstruct the evolution of the depositional environments of the Permian and Triassic series and the palynological evolution of the Permian to Lower Jurassic series. High-resolution sequence stratigraphy of the Permian and Triassic series of the Paris Basin, based on well-log analysis, is used to determine seven progradational-retrogradational cycles in the Permian and twelve cycles in the Triassic. Out of the 54 samples collected from the Sancerre-Couy-1 core, only 23 were palynologically productive. Based on the taxonomic composition, four palynological assemblages are distinguished, three of which have been described in previous studies. These three classical palynological assemblages of the Sancerre-Couy-1 core are documented in detail for the first time in this present study. The description of the new assemblage and its correlation can be used to reassess the previously assigned ages: assemblage SC-1 is late Ladinian in age, SC-2 is of the Ladinian–Carnian transition, SC-3 is early Carnian in age, and SC-4 is of late Rhaetian age, whereas it had previously been assigned a Hettangian age.
       
  • Stratigraphy of the Northern Pulo do Lobo Domain, SW Iberia Variscides: A
           palynological contribution
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Zélia Pereira, Paulo Fernandes, João X. Matos, Raul C.G.S. Jorge, José T. Oliveira We present palynological results from the northern sector of the Pulo do Lobo Domain, combining sections studied in Portugal and Spain. A total of 139 samples were studied, of which 56 are positive for palynology. The first age determination for the Pulo do Lobo Formation was achieved, indicating a mid-Frasnian age (Verrucosisporites bulliferus and Pustulatisporites rugulatus). The sediments of Peramora Mélange (Spain) yielded the same palyno-assemblage as that of the Pulo do Lobo Fm. and are interpreted as a part of this formation. The Ribeira de Limas Fm. also yielded mid-Frasnian miospore assemblages, indicating the same age as the Pulo do Lobo Fm. The Santa Iria and Horta da Torre formations present spore assemblages assigned to the late Famennian in both Portugal and Spain. The phyllites interbedded with the quartzites of the Alájar Mélange yielded a palyno-assemblage late Famennian in age that can be correlated to the Horta da Torre Fm. Therefore, the Alájar quartzites are interpreted as a lateral equivalent of the Horta da Torre Fm. in Spain. The palynological results obtained for the units of the northern sector of the Pulo do Lobo Domain are highly consistent and in agreement with stratigraphic mapping and structural interpretations. A detailed discussion of the palynological versus geochronological ages based on detrital zircons is included in this study. The palynological results and their comparison with the worldwide Upper Devonian palynological record suggest a close affinity with NW European palynofloras, placing the Pulo do Lobo Domain within the Avalonian paleobiogeographical province.
       
  • Palaeobiogeographic and metric analysis of the Mesozoic fern
           Weichselia
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Candela Blanco-Moreno, Bernard Gomez, Ángela Buscalioni Eighty-three publications have been examined to recover information on the palaeogeography, the chronostratigraphy and the presence of the fossil fern genus Weichselia Stiehler in different depositional environments. This fossil fern foliage was reported in 72 localities worldwide. Its fossil record ranges from the Bathonian to the Cenomanian, predominating from the Berriasian to the Barremian, but still common during the Aptian to Cenomanian. Weichselia mostly occurred in continental depositional environments in Europe, whereas it has been mostly related to marginal marine depositional environments in Africa, North America, and India. Three species have been described: W. reticulata, W. peruviana, and W. negevensis. We analyse the measurements on specimens collected from sixteen localities as well as published data from twelve others. Our results suggest that: (i) the climate changes during the Aptian might have affected the pinnule size of Weichselia, as the Aptian-Cenomanian pinnules are larger than those from the Berriasian-Barremian; (ii) some differences might be explained by the metric variation of the frond parts; (iii) there are no clear differences in size between remains collected from different depositional environments; (iv) there is no sufficient evidence to determine how many species of Weichselia have existed.
       
  • Palynostratigraphical dating of the Lower Cretaceous Peñaferruz
           Formation, San Pedro de Antromero Beach (Asturias Region, northwestern
           Iberian Peninsula)
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Iván Rodríguez-Barreiro, Uxue Villanueva-Amadoz, Artai A. Santos, José B. Diez A palynological assemblage of five Lower Cretaceous stratigraphic levels corresponding to the Peñaferruz Formation in San Pedro de Antromero Beach, has been studied to determine the exact age of this formation. An age no older than the Aptian is suggested on the basis of the palynoflora, based on the presence of Trilobosporites hannonicus, Cicatricosisporites venustus, Cicatricosisporites berouensis, Ephedripites dudarensis, and Reticulisporites semireticulatus. This age assignment implies a new relationship between the Peñaferruz and Antromero formations, the Peñaferruz Formation being younger than previously thought. This possibly makes both formations contemporaneous, at least at the San Pedro de Antromero Beach section, suggesting a lateral change of facies between these deposits.
       
  • Cycadeoidea marylandica (Bennettitales) from the late Albian of Spain and
           its palaeophytogeographical implications
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Luis Miguel Sender The first evidence of the presence of Cycadeoidea marylandica (Order Bennettitales) in the Cretaceous of Eurasia is presented. The single specimen consists of a trunk fragment found in the late Albian deposits of the Utrillas Formation, near the village of Gargallo (NE Spain). It is a cylindrical fragment of a silicified trunk with exceptional preservation of external structures (leaf scars and cones). The characteristics of the cones indicate different states of development. The presence of this taxon in deposits of southwestern Eurasia further supports the hypothesis that floristic exchange occurred between North America and the islands that composed the Iberian Plate during Albian times.
       
  • New data about Early Cretaceous Ginkgoales from southwestern Europe
           (middle-late Albian of Spain)
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Luis Miguel Sender, José Bienvenido Diez, Javier Ferrer We present in this work a leaf-type corresponding to the Ginkgoales genus Sphenobaiera recorded in deposits from the middle-upper Albian (Lower Cretaceous) of northeastern Spain. The fossil leaf shows a widely dissected lamina that forks regularly six times ending at the apex in sixty-four tiny wedge-shaped segments, which are characters similar to those in Sphenobaiera pecten from the Middle Jurassic of England. The exceptional preservation of this fossil leaf, which preserves all segments in connection with its base, in addition to taphonomical and sedimentological data, indicates a nearby location for the parent plant, which grew near the shores of a tidally-influenced fluvial environment. A palaeoenvironmental reconstruction of the sub-environments where the different types of Ginkgoales known from the Albian of northeastern Spain developed is also presented. The presence of a variety of different types of Ginkgoales in middle-upper Albian deposits from Spain represents a new contribution to the knowledge of the palaeoenvironmental conditions for this region of southwestern Eurasia during the late Early Cretaceous.
       
  • The Early Jurassic palynostratigraphy of the Lusitanian Basin, western
           Portugal
    • Abstract: Publication date: December 2018Source: Geobios, Volume 51, Issue 6Author(s): Vânia F. Correia, James B. Riding, Luís V. Duarte, Paulo Fernandes, Zélia Pereira A comprehensive investigation of the Early Jurassic stratigraphical palynology of the Lusitanian Basin in western Portugal was undertaken, with most emphasis placed on dinoflagellate cysts. A total of 214 samples from an upper Sinemurian to upper Toarcian composite section based on six successions were examined. The Sinemurian material examined was barren of dinoflagellate cysts; however, the Pliensbachian and Toarcian successions are characterised by relatively low diversities where Luehndea spinosa, Mancodinium semitabulatum, Mendicodinium microscabratum, Nannoceratopsis gracilis, Nannoceratopsis senex, and Scriniocassis priscus are relatively common and biostratigraphically significant. Luehndea spinosa dominates the lowermost Toarcian (Dactylioceras polymorphum ammonite Biozone), and is an index species. At the base of the Hildaites levisoni ammonite Biozone, the effects of the Toarcian Oceanic Anoxic Event (T-OAE) caused Luehndea spinosa to become extinct. At the same time, dinoflagellate cyst abundance and diversity markedly decreased. After the T-OAE, during the middle and late Toarcian, phytoplankton recovery was prolonged and slow in the Lusitanian Basin. The Luehndea spinosa and Mendicodinium microscabratum dinoflagellate cyst biozones are defined, both of which are subdivided into two dinoflagellate cyst subbiozones.
       
 
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