Geobios最新文献

{"title":"Triplinerved cinnamon from the Siwalik (middle Miocene) of eastern Himalaya: Systematics, epifoliar fossil fungi, palaeoecology and biogeography","authors":"Sumana Mahato ,&nbsp;Taposhi Hazra ,&nbsp;Sandip More ,&nbsp;Mahasin Ali Khan","doi":"10.1016/j.geobios.2023.10.003","DOIUrl":"10.1016/j.geobios.2023.10.003","url":null,"abstract":"<div><p><em>Cinnamomum</em> Schaeffer (avocado, family Lauraceae), commonly known as cinnamon tree, is a highly diverse, economically important evergreen element of tropical and subtropical regions of the world. In the present work, several compressed leaf remains similar to modern leaves of <em>Cinnamomum</em> are recovered from the lower part of the Siwalik strata (middle Miocene) of Darjeeling foothills, eastern Himalaya. The fossil specimens are characterized by an elliptic to ovate lamina, acute to short acuminate apex, round to acute base, basal as well as suprabasal acrodromous type of primary venation, and anomocytic type of stomata. Based on leaf architecture (macro- and micromorphological features) and using leaf epidermal anatomy, these Siwalik fossil leaves are confidently assigned to the genus <em>Cinnamomum</em> and are recognized as a new species: <em>C. miocenicum</em> Mahato, Hazra et Khan. The evidence of current Siwalik specimens and earlier-reported fossil species similar to thermophilic <em>Cinnamomum</em> in appreciable numbers from other Siwalik localities (Darjeeling, Uttarakhand, and Nepal) suggests that <em>Cinnamomum</em> was a common Siwalik element, pointing toward the existence of tropical, warm and humid climate conditions during the Siwalik sedimentation time. This conclusion is also supported by epifoliar fungal remains recovered from cuticular fragments of this lauraceous taxon. This finding also represents an essential source of data for understanding <em>Cinnamomum</em>’s evolution and deep time diversification. We review in detail the biogeographic history and suggest possible migratory routes of the genus from an Asian perspective.</p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135615501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Taxonomy, biostratigraphy and paleobiogeography of Strenuaeva (Trilobita) from the Marianian (Cambrian Series 2) of Iberia","authors":"Luis Collantes ,&nbsp;Sofia Pereira ,&nbsp;Eduardo Mayoral ,&nbsp;Eladio Liñán ,&nbsp;Alexandre Sepúlveda ,&nbsp;Rodolfo Gozalo","doi":"10.1016/j.geobios.2023.09.002","DOIUrl":"10.1016/j.geobios.2023.09.002","url":null,"abstract":"<div><p>Problems surrounding the identification and systematics of taxa belonging to the trilobite family Ellipsocephalidae have been discussed for several decades. The ellipsocephalid genus <em>Strenuaeva</em> is revised herein on the basis of material from Spain, including the type material of the identified species together with newly collected specimens from the Ossa-Morena Zone and the Iberian Chains. Two species are recognized as valid for these regions: <em>S</em>. <em>sampelayoi</em> and <em>S</em>. <em>incondita</em>. The species ‘<em>S</em>. <em>melendezi</em>’ and ‘<em>Ellipsostrenua alanisiana</em>’ from Spain, as well as ‘<em>S</em>. <em>marocana</em>’ from Morocco, are considered junior synonyms of <em>S</em>. <em>sampelayoi</em>. Previous assignment of the Spanish species to <em>Issafeniella</em> is rejected. The abundant available material of <em>S</em>. <em>sampelayoi</em> made it possible to evaluate the taphonomical role in the preservation of some characters and to recognize intraspecific variability similar to that described in <em>S</em>. <em>inflata</em> from Baltica, reinforcing its assignment to <em>Strenuaeva</em>. Biostratigraphically, <em>Strenuaeva</em> ranges from uppermost Cambrian Stage 3 to uppermost Cambrian Stage 4. In Iberia, it is restricted to the middle Marianian in the Ossa-Morena Zone, whereas it is known from the lowermost middle Marianian to the lowermost upper Marianian in the Iberian Chains. <em>Strenuaeva</em><span> is known from Baltica (Scandinavia and Holy Cross Mountains, Poland), Iberia (Spain), Morocco and, possibly, western Avalonia (Newfoundland), hence being a characteristic genus of the Acadobaltic faunal Province.</span></p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135614551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental and vegetation dynamics through the Oligocene to Early Miocene of North Africa (Egypt)","authors":"Mohamed I.A. Ibrahim ,&nbsp;Eman Bassiouni ,&nbsp;Rafik El-Ghareeb ,&nbsp;Azza Shehata ,&nbsp;Haytham El Atfy","doi":"10.1016/j.geobios.2023.07.005","DOIUrl":"10.1016/j.geobios.2023.07.005","url":null,"abstract":"<div><p><span>This study documents palynomorph assemblages from the Oligocene<span><span> through the Early Miocene<span>, across the significant Warm-house to Cool-house transition, using a subsurface section from the AG-5 well, north Western Desert of Egypt. Although the Paleogene and Neogene strata occupied a large area of the land, little about vegetation and ecosystem processes that shaped the climate and biodiversity during this time window is known. Here, based on a comprehensive palynological analysis of the Oligocene to Early Miocene Dabaa and Moghra formations encountered in the AG-5 well, we show that the studied area was characterized by a humid tropical to subtropical climate during the Oligocene-Miocene time interval. The obtained results provide clear evidence of the poorly known Paleogene-Neogene ecosystem in </span></span>North Africa. In terms of palynostratigraphical framework, three palynozones covering the late Oligocene-Early Miocene interval are recognized. Moreover, the recovered palynomorphs inferred a deposition of the Dabaa Formation under a normal marine, inner shelf to </span></span>littoral environment<span>. However, for the basal part of the Moghra Formation, a deposition in an offshore marine environment, outer shelf (high sea level, 100–200 m depth) is assumed, whereas a deposition in shallow coastal lagoons, estuary, or delta environment (low sea level) is presumed for its uppermost part.</span></p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135614577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shelly coprolites record durophagous predation in the Late Ordovician Bohdalec Formation (Katian; Prague Basin, Czech Republic)","authors":"Russell D.C. Bicknell ,&nbsp;Jana Bruthansová ,&nbsp;Julien Kimmig","doi":"10.1016/j.geobios.2023.09.001","DOIUrl":"10.1016/j.geobios.2023.09.001","url":null,"abstract":"<div><p><span><span><span>Trace fossils<span> can illustrate important palaeobiological interactions within a fossil assemblage that body fossils do not record. A group of trace fossils that showcase feeding ecology, and evidence of predation, are </span></span>coprolites. Shelly coprolites are useful for documenting records of durophagous predators or scavengers within a substrate. To expand the record of these traces from the lower Paleozoic, here we present 12 shelly coprolites from the </span>Late Ordovician (Katian) Bohdalec Formation of the Czech Republic. These coprolites contain abundant </span><em>Onnia superba</em> (<span>Bancroft, 1929</span><span>) fragments with marked breakages across exoskeletal sections. Rarer evidence for gastropods, bivalves, crinoid debris, and another indeterminate shelly material are also observed within the coprolites. While the producer cannot be irrevocably determined, possible options are explored. We propose that larger, co-occurring trilobites and predatory cephalopods likely made the majority of coprolites. Furthermore, large unbiomineralised arthropods, such as phyllocarids and eurypterids are highlighted as possible producers. Continued examination of these trace fossils will highlight when and where similar interactions between trophic levels had occurred.</span></p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135615508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Pleistocene small mammals (Chiroptera, Rodentia, Lagomorpha) from Agios Georgios Cave (Kilkis, Central Macedonia, Greece)","authors":"Pavlos Piskoulis,&nbsp;Evangelia Tsoukala,&nbsp;Ioanna Tsiourlini","doi":"10.1016/j.geobios.2023.07.006","DOIUrl":"10.1016/j.geobios.2023.07.006","url":null,"abstract":"<div><p>The Late Pleistocene small mammal fauna from Agios Georgios Cave (Kilkis, Central Macedonia, Greece) is examined, resulting in the identification of 14 species of Chiroptera, Rodentia and Lagomorpha. The palaeoenvironment of the area around the cave seems to have been a relatively arid, steppe-like plain with sparsely-wooded patches. There was also a permanent or temporary water body near the cave. The palaeoclimate of the region was colder than today, but rather warm compared to more northern parts of Europe, which were strongly affected by the Last Glacial Maximum.</p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135614553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palynological investigation of an Upper Triassic sequence in Nanjing area, eastern China, with paleoecological implications","authors":"Liqin Li ,&nbsp;Yuanyuan Xu ,&nbsp;Yongdong Wang ,&nbsp;Wolfram M. Kürschner","doi":"10.1016/j.geobios.2023.07.002","DOIUrl":"10.1016/j.geobios.2023.07.002","url":null,"abstract":"<div><p>The end-Triassic is characterized by a significant biotic crisis in both marine and terrestrial realms. However, terrestrial records in eastern Tethys are relatively limited, especially in eastern China. The Fanjiatang Formation represents the Upper Triassic sequence in southern Jiangsu and Anhui provinces of eastern China, yielding a rich plant and bivalve fossil record. The present study provides the first detailed palynological investigation for the Upper Triassic of Nanjing area, eastern China. Six of twenty processed palynological samples are productive, and more than 70 terrestrial spore and pollen fossil taxa were identified. A palynological assemblage, namely, the <em>Concavisporites</em>–<em>Dictyophyllidites</em>–<em>Kyrtomisporis</em>–<em>Classopollis</em> Assemblage was established, characterized by abundant fern spores, mainly including <em>Concavisporites</em>, <em>Dictyophyllidites</em> and <em>Kyrtomisporis</em>, and much less abundant gymnosperm pollen grains (important taxa include <em>Alisporites</em>, <em>Chasmatosporites</em>, and <em>Classopollis</em>), indicating a Late Triassic Norian–Rhaetian age. In conjunction with previously reported macro-plant data, the palynofloral analysis reveals a vegetation dominated by ferns, with diverse cycadophytes, less abundant lycophytes, bryophytes, equisetales, ginkgophytes and seed ferns, and a few conifers. Paleovegetation and semiquantitative palynological analysis permit a paleoecological interpretation, suggesting a lowland groundcover-dominated vegetation under (sub)tropical warm and humid climate in Nanjing area during this time interval. More detailed palynological and macro-plant data through the whole Upper Triassic in this region are necessary in the future to better reveal the Late Triassic paleoecological settings and variations on land prior to the end-Triassic mass extinction in eastern Tethys.</p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41842529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Macaronichnus ‘co-occurrence’ in offshore transition settings: Discussing the role of tidal versus fluid muds influence","authors":"Francisco J. Rodríguez-Tovar,&nbsp;Fernando García-García","doi":"10.1016/j.geobios.2023.07.001","DOIUrl":"10.1016/j.geobios.2023.07.001","url":null,"abstract":"<div><p><em>Macaronichnus</em> is a key trace fossil in palaeoceanographic, palaeoclimatic, and petroleum exploration research. Small ichnosubspecies such as <em>Macaronichnus segregatis segregatis</em>, <em>M. s. lineiformins</em>, <em>M. s. maeandriformis</em> and <em>M. s. spiriformis</em>, typically occur in wave-dominated foreshore sands where large <em>M. s. degiberti</em> was never found. The latter shows a wide environmental distribution, occurring in sandy deposits of tidal channels, tidal bar sand sandridges, tidal-flat sand sheets, shorefaces, bioturbated sandy shelf, shelf storm-sheets, shelf sand ridges, and upper slopes. Small <em>M. segregatis</em> and large <em>M. s. degiberti</em> have not been observed to date due the ecological segregation of the tracemakers. An abundant record of large <em>M. s. degiberti</em> in a Tortonian (Late Miocene) mixed carbonate-siliciclastic unit from the Betic Cordillera (southern Spain) has been studied. Occurrence of <em>M. s. degiberti</em> is the result of the interaction of tidal and waves, storm influenced environment determining high-energy conditions and associated palaeoenvironmental parameters as shifting substrates, organic matter availability, and oxygenated pore and bottom-waters. Locally, associated to <em>M. s. degiberti</em> appear small, sinuous traces infilled by light material that were originally assigned to <em>M. s. maeandriformis</em>, and very rare <em>M. s. spiriformis</em>. However, the absence of the typical rim of <em>Macaronichnus</em> avoid a conclusive assignment. The coexistence of both small traces (?<em>M. s. maeandriformis</em>) and large <em>M. s. degiberti</em> is identified in the deposits underlying mudstone layers, revealing the importance of mud deposition during tidal slack water intervals or linked to fluid mud events favouring the co-occurrence of the trace makers of both <em>Macaronichnus</em> ichnosubespecies. This fact would have significant palaeobiological and palaeoecological implications, and could be the first record of both ichnosubspecies in the same intervals.</p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0016699523000669/pdfft?md5=d81f332d3ad608fec199c1b1dd4dad73&pid=1-s2.0-S0016699523000669-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43807440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New lizard material from two Early Miocene localities in France: Montaigu-le-Blin (MN 2) and Crémat (MN 3)","authors":"Andrej Čerňanský","doi":"10.1016/j.geobios.2023.06.007","DOIUrl":"10.1016/j.geobios.2023.06.007","url":null,"abstract":"<div><p>Squamate faunas from the MN 1–3 intervals (earliest Miocene) are scarcely documented from the European continent. I here describe squamate faunas from two French localities – Montaigu-le-Blin (MN 2) and Crémat (MN 3), the latter being the youngest locality of the <span><em>Phosphorites</em><em> du Quercy</em></span><span><span>. The palaeobiodiversity of squamates from these sites is low relative to the faunas described from coeval localities of Amöneburg (MN 2) in Germany and Merkur-North (MN 3) in the Czech Republic. The beginning of the Miocene represents the temporary return to a paratropical humid climate after the relatively cool and dry </span>Oligocene<span><span>, and the Montaigu and Crémat materials provide previously undocumented components of herpetofaunas and their changes during this crucial time interval in France. The importance of </span>fossil squamates from the area of the </span></span><em>Phosphorites du Quercy</em> is therefore highlighted for the beginning of the Miocene as well as the better known Eocene-Oligocene sites. The lizard material of Montaigu includes lacertids and blanids, the latter being represented by <em>Blanus</em> cf. <em>gracilis</em><span>, one of the oldest records of the genus. Moreover, it shows a higher spatial and temporal distribution of this amphisbaenian species during the Early Miocene than previously known. The material from Crémat consists of few elements which can be allocated to anguids and potentially to lacertids. Detailed figures of the specimens are provided through the means of both photography and micro-CT scanning.</span></p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135349539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First fossil evidence of samaras of Ailanthus Desf. (Simaroubaceae) from India and its implications","authors":"Taposhi Hazra,&nbsp;Mahasin Ali Khan","doi":"10.1016/j.geobios.2023.07.003","DOIUrl":"10.1016/j.geobios.2023.07.003","url":null,"abstract":"<div><p>Even though it is now widespread in Asia and was widely distributed in the Northern Hemisphere during the Cenozoic, fruits of the genus <em>Ailanthus</em> Desf. (Simaroubaceae) have not previously been documented from the Cenozoic of India. Here, we report the first Indian occurrence of fossil winged fruits corresponding to the modern genus <em>Ailanthus</em> having samaroid mericarps with a centrally placed seed from the latest Neogene sediments of Chotanagpur Plateau, eastern India. We determine their taxonomic position based on a detailed morphological comparison with similar modern and fossil specimens and discuss their palaeoclimatic significance. The fossil fruits are elongated, elliptic samaroid mericarps with a centrally placed seed and a marginal ventral vein starting from the seed extend to the base of the fruit. The fruits are 24–39 mm long and 11–16 mm wide. Based on the available morphological characters including locations of the stylar scar, main ventral vein, and the size of the samara, we assign these specimens to the fossil species <em>Ailanthus confucii</em> Unger. This species has a rich fossil record from the Cenozoic sediments of Europe, North America, and eastern Asia. However, this is the first report of <em>A. confucii</em> in India, which is significant for this species’s biogeographic and evolutionary history. Based on morphological comparisons, <em>A. confucii</em> shows affinity to modern <em>A. altissima</em>. Here, we also review the biogeographic history of <em>Ailanthus</em> and suggest its possible migratory routes.</p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49127845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An oversized, late-surviving reticulosan sponge from the Carboniferous of Ireland","authors":"Joseph P. Botting ,&nbsp;Lucy A. Muir ,&nbsp;Eamon Doyle","doi":"10.1016/j.geobios.2023.07.004","DOIUrl":"10.1016/j.geobios.2023.07.004","url":null,"abstract":"<div><p><em>Cyathophycus</em><span><span> is one of the most widespread reticulosan sponges in Ordovician to </span>Devonian rocks, but was mostly limited to the Iapetus region during the Ordovician and Silurian periods. Having an unfused skeleton, these sponges require an element of exceptional preservation (abrupt burial as a minimum) to enter the fossil record. Most species are a few centimetres in size, and found in muddy offshore environments. A new species of </span><em>Cyathophycus</em>, <em>C</em>. <em>balori</em><span><span> nov. sp., from the Kilkee Cyclothem of the </span>Namurian<span> Central Clare Group of County Clare, Ireland, substantially extends the stratigraphic range of the genus into the upper Palaeozoic. At more than 50 cm in height, the new species is the largest known </span></span><em>Cyathophycus</em><span>, and one of the largest reticulosan sponges. The sponges are found abundantly as monospecific assemblages in a particular band of laminated mudstone in prodelta cyclothem deposits. This unexpected discovery reveals a new component to Carboniferous prodeltaic ecosystems, and is further evidence that early sponge groups persisted in some unusual and marginal environments.</span></p></div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41621394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}