Palaeoworld最新文献

{"title":"A new systematic study on Hystrix findings from eastern Aegean area","authors":"Kazım Halaçlar ,&nbsp;Berna Alpagut ,&nbsp;Serdar Mayda ,&nbsp;Tao Deng","doi":"10.1016/j.palwor.2024.100873","DOIUrl":"10.1016/j.palwor.2024.100873","url":null,"abstract":"<div><div>This study introduces <em>Hystrix aegeanensis</em> n. sp., a new late Miocene (MN 12) porcupine species from Samos, Greece, and Karaağaç, Türkiye. This represents the fifth record of late Miocene <em>Hystrix</em> from Europe and Asia Minor. <em>H</em>. <em>aegeanensis</em> n. sp. exhibits a unique occlusal outline and pattern compared to those of all other late Miocene <em>Hystrix</em> species. This study further clarifies the systematic divergence among late Miocene <em>Hystrix</em> species based on occlusal outlines and patterns. The first group, including <em>H</em>. <em>parvae</em>, <em>H</em>. <em>primigenia</em>, <em>H</em>. <em>gansuensis</em>, <em>H</em>. <em>brevirostra</em>, and <em>H</em>. <em>lufengensis</em>, exhibits a simple occlusal pattern and an oval/square occlusal outline. In contrast, the second group, comprising <em>H</em>. <em>aegeanensis</em> n. sp., <em>H</em>. <em>kayae</em>, and <em>H</em>. <em>aryanensis</em>, displays a more complex occlusal pattern and a rectangular occlusal outline on their upper cheek teeth.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100873"},"PeriodicalIF":1.7,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conodonts suggest a late Spathian (late Early Triassic) age for Thaisaurus chonglakmanii (Reptilia: Ichthyosauromorpha) from Thailand","authors":"Si-Yao Ye ,&nbsp;Kui Wu ,&nbsp;Zuo-Yu Sun ,&nbsp;P. Martin Sander ,&nbsp;Adun Samathi ,&nbsp;Yuan-Yuan Sun ,&nbsp;Cheng Ji ,&nbsp;Varavudh Suteethorn ,&nbsp;Jun Liu","doi":"10.1016/j.palwor.2024.07.004","DOIUrl":"10.1016/j.palwor.2024.07.004","url":null,"abstract":"<div><div>The timing of the emergence of marine reptiles following the Permian–Triassic mass extinction is crucial for studying the recovery of marine ecosystems in the Triassic. Conodonts, key index fossils in the Triassic, are widely used to date the marine reptiles, especially in the Early Triassic. <em>Triassospathodus anhuinensis</em> is a conodont species originally discovered in the upper Spathian of South China, but lacked a comprehensive description, leading to misidentifications and confusion in previous research. Here, we reevaluated <em>Tr</em>. <em>anhuinensis</em> and summarized its morphological characteristics and spatial and temporal distribution based on a review of the literature. We then critically evaluated the age of the primitive ichthyosaur <em>Thaisaurus chonglakmanii</em> from Thailand based on the updated knowledge of <em>Tr</em>. <em>anhuinensis</em>. We sampled the Khao Thong section where <em>T</em>. <em>chonglakmanii</em> was found for conodont study. <em>Tr</em>. <em>anhuinensis</em> elements were obtained from the bed where <em>T</em>. <em>chonglakmanii</em> was collected and also in the bed five metres above the <em>T</em>. <em>chonglakmanii</em> fossil horizon, suggesting a late Spathian age for <em>T</em>. <em>chonglakmanii</em>. A late Spathian age for <em>T</em>. <em>chonglakmanii</em> questions the hypothesis of Thailand as the place of origin of ichthyosaurs in the late Induan or early Spathain.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100872"},"PeriodicalIF":1.7,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141841189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lutetian–Bartonian (Middle Eocene) micropalaeontology, biostratigraphy and palaeoecology of the Mengen Coal Basin, Northwest Türkiye (Turkey)","authors":"Sariye Duygu Durak ,&nbsp;Mehmet Serkan Akkiraz ,&nbsp;Nazire Özgen-Erdem ,&nbsp;Atike Nazik ,&nbsp;Fuzuli Yağmurlu ,&nbsp;Derya Sinanoğlu","doi":"10.1016/j.palwor.2024.07.003","DOIUrl":"10.1016/j.palwor.2024.07.003","url":null,"abstract":"<div><div>This study focuses on the upper Lutetian–lower Bartonian Tokmaklar Formation in the Mengen Basin of Northwest Türkiye (Turkey), examining various aspects such as biostratigraphy, palaeoecology, and isotope data (δ¹⁸O and δ¹³C), providing insights into the geological history and environmental conditions during this interval. Moreover, the study incorporates coal petrography on four samples to explore a potential correlation between the coalification process and the preservation of palynomorphs. The formation is informally divided into two distinct categories: a coal-bearing sequence positioned at the base of the formation and a coal-free sequence above it. However due to dense vegetation and soil cover in the area, the availability of suitable outcrops for measured sections and obtaining samples is severely limited. Therefore, we relied on drilling data from Turkish Coal Enterprises (TCE) for the purpose of coal exploration, as well as two partial sections (Ender and Çorak) from underground mining. Microapalaeontological evidences involving benthic foraminiferans, ostracods, and palynomorphs, along with isotope data (δ¹⁸O and δ¹³C), suggest that the Tokmaklar Formation was deposited as a result of a local transgressive process during the late Lutetian–early Bartonian. Furthermore, palynological data, particularly the existence of mangroves such as <em>Nypa</em>, lepidocaryoid palm and <em>Acrostichum aureum</em>, coupled with quantitative palaeoclimate analysis, the negative δ¹⁸O values, and the lower δ¹³C values indicate a warm, probably tropical climate under high rainfall.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100871"},"PeriodicalIF":1.7,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141845076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large diploporitan thecal attachment structures on diploporitan thecae: An uncommon encrustation relationship involving stalked echinoderms from the Silurian of the Cincinnati Arch region, eastern midcontinental USA","authors":"James R. Thomka ,&nbsp;Thomas E. Bantel ,&nbsp;Donald L. Bissett ,&nbsp;Drew A. Billups","doi":"10.1016/j.palwor.2024.07.001","DOIUrl":"10.1016/j.palwor.2024.07.001","url":null,"abstract":"<div><div>Holocystitid diploporitans (Echinodermata) are abundant within the middle Silurian (Wenlock: Sheinwoodian) Massie Formation of southeastern Indiana, USA. Diploporitan thecae are commonly encrusted by a variety of organisms, including the attachment structures of crinoids; however, no diploporitan aboral thecal attachments have previously been described in detail as encrusters on co-occurring diploporitan thecae. Herein, we describe thecae of <em>Holocystites scutellatus</em> that are encrusted by large discoidal attachment structures attributable to undetermined holocystitid diploporitans. The thecal attachment structures are discoidal, multi-plated, pore-bearing, and characterized by circular central depressions floored by flat platforms — a morphology that is identical to that of diploporitan attachments described from a laterally continuous hardground surface at the same locality. These encrusted specimens are significant because they demonstrate that (1) encrusting diploporitans were capable of developing identical aboral attachment morphologies when encountering both hardgrounds and sufficiently large bioclasts in softgrounds; and (2) encrusted diploporitan thecae were capable of remaining articulated long enough and in a sufficiently stable position to serve as substrata for large thecal attachments. Taken collectively, holocystitid diploporitans were characterized by greater aboral morphological plasticity and resistance to disarticulation than generally recognized.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100851"},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biogeographic dynamics of graptolites during the Late Ordovician Mass Extinction in South China","authors":"Lin-Na Zhang ,&nbsp;Sha-Sha Sun ,&nbsp;Zong-Yuan Sun ,&nbsp;Ming-Feng Lu ,&nbsp;Qing Chen","doi":"10.1016/j.palwor.2024.06.008","DOIUrl":"10.1016/j.palwor.2024.06.008","url":null,"abstract":"<div><div>Studying the temporal and spatial distributions and dynamics of fossils is crucial for understanding macroevolution processes in geological history. Biodiversity data provide an overview of faunal changes during extinction events, but it cannot differentiate the impact of extinction events on different species. Biogeographic study complements these data by offering more detailed insights into evolutionary patterns. A dataset of 704 graptolite occurrence records for the Late Ordovician Mass Extinction (LOME) was compiled from 60 localities in South China. The geographic distributions of 26 species across four graptolite biochrons (from late Katian to Hirnantian) were quantitatively reconstructed using ArcGIS. Two types of geographic range indexes, including convex hull areas and maximum distribution distances, were calculated for each species in each time slice. Based on the variations in the geographic ranges, the graptolites can be divided into three types. The geographic ranges of the first type shrank before the extinction, that of the second type expanded before the extinction but shrank during the extinction, and that of the third type expanded during the extinction. The first two types include Diplograptina species; and the third of Neograptina species. The study revealed that the extinction event affected all diplograptid graptolite species, as evidenced by the rate of decrease in geographic ranges. Interestingly, the impact of the major extinction appeared to be uniform across all graptolite species, irrespective of their initial geographic range size. The distribution centers of the graptolite species remained relatively stable and predominantly surrounded the center of the sea during the LOME. The substantial reduction in the geographic ranges of diplograptid species might be due to the global factors rather than local sea level decline.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100868"},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new species of Pseudotsuga (Pinaceae) from the lower Miocene of Lesvos, Greece, and its palaeogeographical and palaeoclimatic implications","authors":"Yan-Bin Zhu ,&nbsp;Ya Li ,&nbsp;Jian-Ping Zhang ,&nbsp;Yong-Dong Wang ,&nbsp;Nikolaos Zouros","doi":"10.1016/j.palwor.2024.06.001","DOIUrl":"10.1016/j.palwor.2024.06.001","url":null,"abstract":"<div><div><em>Pseudotsug</em>a Carrière is commonly known as Douglas-fir, a minor genus attributed to Pinaceae of conifer. Four extant species are included in this genus, with dispersed distribution in East Asia and western North America. <em>Pseudotsuga</em> possesses a number of fossil records of needled leaves, seed cones, and seeds. Nevertheless, few reliable fossil wood of this genus has been specifically investigated. Here, we describe some anatomically well-preserved petrified fossil wood from the lower Miocene of Lesvos Island, Greece, as <em>Pseudotsuga lesvosensis</em> n. sp. The studied fossil wood remains are characterized by the presence of normal axial and radial resin canals, piceoid cross-field pitting, along with distinctive helical thickenings in cell walls consistent with <em>Pseudotsuga</em>. The present fossil conifer further enriches the species diversity of the Miocene Petrified Forest in Lesvos. The first report of <em>Pseudotsuga lesvosensis</em> from the southern Europe in this study extends the tempo-spatial distribution patterns of <em>Pseudotsuga</em> and contributes to further understanding of its origin and evolutionary history. The occurrence of <em>P</em>. <em>lesvosensis</em> fossil wood, as well as other palaeontological macrofloral composition evidence, indicates a humid warm temperate to subtropical climatic condition during the early Miocene within the Lesvos, which differs significantly from the current Mediterranean climate.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100852"},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Actinopterygians from the continental Permian–Triassic boundary section at Babiy Kamen (Kuznetsk Basin, Siberia, Russia)","authors":"Aleksandr S. Bakaev","doi":"10.1016/j.palwor.2024.05.007","DOIUrl":"10.1016/j.palwor.2024.05.007","url":null,"abstract":"<div><div>The Kuznetsk Basin in Siberia (Russia) is an important area for the study of the continental biota of late Permian to Early Triassic in continuous sections. This study presents a taxonomic description of ray-finned fishes (other fish remains are absent at the section) from the Permian–Triassic boundary section at Babiy Kamen. The new material was collected, bed by bed, during geological and paleontological excavations of coastal-floodplain, shallow-basin deposits of the Tailugan and Maltseva formations. The poorly preserved but diverse ichthyofaunal fossils of the Tailugan Formation consists predominantly of typical Late Paleozoic “palaeoniscoid” fishes (Eurynotoidiidae, Varialepididae, etc.). The earliest known Triassic (Induan) Kedrovo Member of the Maltseva Formation contained a less diverse but well preserved ichthyofaunal fossils including “palaeoniscoid” fishes (<em>Korutichthys</em> and <em>Avamia</em>). The same species were described earlier from the Induan of the Tunguska Basin. The ichthyofauna of the Early Triassic (Olenekian) Ryaboy Kamen Member of the Maltseva Formation consists of typical Triassic stem-neopterygian (<em>Evenkia</em>, <em>Eoperleidus</em> and <em>Arctosomus</em>) fishes. The same fishes have been described earlier from the Olenekian of Tunguska Basin. The composition of the ichthyofauna completely changed twice — at the Permian–Triassic and the Induan–Olenekian boundaries.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100861"},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Storm deposits and trace fossils of Xinji Formation (Cambrian Series 2) in the southern margin of North China Plate","authors":"Ming-Yue Dai ,&nbsp;Lan-Lan Han ,&nbsp;Yong-An Qi ,&nbsp;Yao-Gang Du ,&nbsp;Zhong-Lei Yin ,&nbsp;Song-Hua Chen ,&nbsp;Shi-Yun Qing","doi":"10.1016/j.palwor.2024.05.009","DOIUrl":"10.1016/j.palwor.2024.05.009","url":null,"abstract":"<div><div>The Xinji Formation (Cambrian Series 2) in the southern margin of the North China Plate developed typical siliciclastic storm deposits and abundant trace fossils. These deposits are characterized by essential indicators, such as erosional surfaces, lag deposits, blocky beddings, hummocky cross stratifications, horizontal or wavy beddings. Storm deposits in the study area are dominated by the development of hummocky cross stratifications, which is categorized into five storm deposit types based on the arrangement of different sedimentary units in the profile. These five types of storm deposits from I to V show the transition from proximal storm deposits to distal storm deposits, the gradual weakening of storm intensity, and the associated growth of quiescent intervals. The trace fossils are mainly developed in the sandstone-mudstone interbeds between storm events and include 14 ichnospecies in 11 ichnogenera: <em>Didymaulichnus</em> isp., <em>Gordia marina</em>, <em>Helminthopsis tenuis</em>, <em>Oldhamia radiata</em>, <em>Palaeophycus striatus</em>, <em>Palaeophycus tubularis</em>, <em>Phycodes</em> isp., <em>Planolites beverleyensis</em>, <em>Planolites montanus</em>, <em>Planolites punctatus</em>, <em>Skolithos</em> isp., <em>Taenidium</em> isp., <em>Torrowangea rosei</em>, <em>Treptichnus pedum</em>. By analyzing the ichnological index (burrow size, BPBI, ichnodiversity and ichnodisparity) from different storm deposits, it can be seen that from storm deposit type I to storm deposit type V, the ichnological index shows an increasing trend. Combined with the relationship between storm deposits and trace fossils, it is inferred that differences in storm intensity result in different colonization windows, and thus variations in ichnological index of preserved trace fossils. Based on the characteristics of storm deposits and distribution of trace fossils, the preservation forms of trace fossils under storm influence are explored.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100866"},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the biostratigraphic relevance of a new record of a traversodontid cynodont in southern Brazil (Candelária Sequence, Upper Triassic)","authors":"Lívia Roese-Miron ,&nbsp;Pedro Henrique Dotto ,&nbsp;Thais Gotuzzo de Menezes Medina ,&nbsp;Átila Augusto Stock Da-Rosa ,&nbsp;Rodrigo Temp Müller ,&nbsp;Leonardo Kerber","doi":"10.1016/j.palwor.2024.05.008","DOIUrl":"10.1016/j.palwor.2024.05.008","url":null,"abstract":"<div><div>The Várzea do Agudo is an Upper Triassic site of the Candelária Sequence of Southern Brazil that boasts an extensive fossil record. It is assigned to the <em>Exaeretodon</em> subzone of the <em>Hyperodapedon</em> Assemblage Zone (AZ) (mid-late Carnian) mainly due to the prevalent presence of the traversodontid <em>Exaeretodon riograndensis</em> — up to now the sole traversodontid discovered at the site. In this study, we report the first record of the traversodontid <em>Siriusgnathus niemeyerorum</em> in the Várzea do Agudo site. The new specimen was excavated from the upper layers of the outcrop. Its identification as <em>S</em>. <em>niemeyerorum</em> is substantiated by diagnostic features such as a poorly developed interorbital depression, an inconspicuous suborbital process of the jugal, a not deeply concave base of the lambdoidal crest, the distal accessory labial cusp of the upper postcanines more labially oriented than <em>E</em>. <em>riograndensis</em>, and two upper incisors — so far, a trait autapomorphic to the species among traversodontids. The age of the type locality of <em>S</em>. <em>niemeyerorum</em> has been a subject of debate. Whereas the <em>Siriusgnathus</em>-bearing sites had been associated with younger levels than those of the <em>Hyperodapedon</em> AZ, the absence of index fossils hampered proper biostratigraphic approaches. The finding of a <em>S</em>. <em>niemeyerorum</em> specimen in the same site as <em>E</em>. <em>riograndensis</em> poses a challenging scenario for the biostratigraphy of the fossiliferous outcrops of the municipality of Agudo. It is noteworthy, however, that the new specimen was excavated above the layers yielding <em>E</em>. <em>riograndensis</em>. This raises the question of whether the fossiliferous stratum of the Várzea do Agudo site was deposited in a single event or in a short period, or if it reflects two different time horizons. In the case of the latter, the existence of early Norian sites with distinct faunal composition near the <em>Siriusgnathus</em>-bearing sites could imply the existence of an intermediate fauna between this AZ and the <em>Exaeretodon</em> subzone of the <em>Hyperodapedon</em> AZ, of which <em>S</em>. <em>niemeyerorum</em> would be a constituent. Considering this context, this study discusses the possible biostratigraphic implications of the new record for the biostratigraphy of the sites of the Candelária Sequence.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 2","pages":"Article 100864"},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early Eocene marine microgastropods from the Zhupure Formation in Yadong, Southern Tibet, China","authors":"Xin-Fa Li ,&nbsp;Guo-Biao Li ,&nbsp;Christopher L. Garvie","doi":"10.1016/j.palwor.2022.12.011","DOIUrl":"10.1016/j.palwor.2022.12.011","url":null,"abstract":"<div><p>Numerous microgastropods are reported for from the Eocene (Ypresian) Zhepure Formation in Tüna, Yadong, Southern Tibet for the first time. Although most of the shells are incompletely preserved, the following eight species of benthic microgastropods are described and illustrated: <em>Eulimella</em> sp., <em>Odostomia</em> aff. <em>pakistanica</em>, <em>Monotygma</em> aff. <em>marcusseni</em>, <em>Syrnola</em> sp., Pyramidellidae (<em>Syrnola</em>?) sp., Pyramidellidae indet. sp., <em>Mathilda</em> (<em>Echinimathilda</em>) cf. <em>duogenta</em> and the new species <em>Turbonilla yadongensis</em> n. sp. As little is known about Paleogene microgastropod fauna in Tibet, the occurrence here could give further information on Cenozoic biostratigraphy of Southern Tibet, the paleoenvironment and late evolutionary history of eastern Tethyan realm. Based on this study of the little-known Eocene microgastropod assemblage, we demonstrate that a shallow marine environment existed during early Eocene in the Southern Tibet.</p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 777-787"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42094232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}