Palaeoworld最新文献

{"title":"Craniomandibular osteology and the first record of the ocular skeleton in a South American rhynchosaur (Archosauromorpha, Hyperodapedontinae)","authors":"Jeung Hee Schiefelbein, Mauricio Silva Garcia, Sérgio Furtado Cabreira, Lúcio Roberto da Silva, Rodrigo Temp Müller","doi":"10.1016/j.palwor.2024.07.002","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.07.002","url":null,"abstract":"A new rhynchosaur specimen from the Upper Triassic (Candelária Sequence) of Southern Brazil is presented in this contribution. While these reptiles constitute some of the most sampled fossils from these beds, their taxonomic, phylogenetic, and palaeobiological status remain understudied. Delving into the cranial elements of the new specimen we performed a taxonomic and phylogenetic assessment, assigning it to “” , a form that occurs in Brazil and Argentina. This assignment was based on distinctive craniomandibular features such as the absence of lingual teeth in the dentary, a unique feature among hyperodapedontine rhynchosaurs. Furthermore, our phylogenetic analysis supports this scenario. Our approach emphasizes the broader need for comprehensive anatomical descriptions of South American rhynchosaurs, particularly in Brazil, where some crucial taxa remain undescribed and/or unfigured. This study also reinforces the need for a revision of the clade Hyperodapedontinae and the genus. The orbital region of the new specimen reveals delicate scleral ossicles, presenting a unique window into the visual adaptations and habits of these reptiles. This is the first record of the ocular skeleton for a rhynchosaur of South America. Beyond the taxonomic and phylogenetic implications, this study elucidates the role of the ocular skeleton in regards to sensory adaptations in hyperodapedontine rhynchosaurs.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781743","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":"Climate and vegetation changes in southern Primorye (Russian Far East) since the Last Glacial Maximum: A quantitative analysis","authors":"Tatiana A. Evstigneeva, Olesia V. Bondarenko, Torsten Utescher","doi":"10.1016/j.palwor.2024.06.009","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.06.009","url":null,"abstract":"The climate and vegetation for southern Primorye during the last 21 kyr are studied for the first time in detail using quantitative techniques on high-temporal resolution pollen record. The data obtained showed a clear relationship with global climate events: Last Glacial Maximum, Heinrich 1, Bølling/Allerød, Younger Dryas and the warmest climate event around ca. 8.0 ka. A moderate monsoon-type climate persisted in Primorye during the last 21 kyr. The mean annual temperature did not fall below 0°C. The magnitude of the glacial–interglacial mean temperature difference in southern Primorye was ca. 7°C. Cold and cool temperate climate existed between ca. 21.0 and 11.6 ka and after 4.3 ka respectively. Climate variables of the Last Glacial Maximum were slightly below present-day values, and drier conditions prevailed compared to the late Holocene. Moderately cool conditions with excessive moisture existed during the cold events of the late Pleistocene, i.e., Younger Dryas and Heinrich 1, and in the late Holocene. Humidification did not occur due to heavy rainfall, but due to less evaporation because of low average annual temperatures during these cold events. During the last 21 kyr, there existed dry and wet seasons in Primorye, as at present, associated with monsoon circulation. The summer monsoon was more intense at ca. 16.6 ka, 14.4 ka, 11.6 ka and from ca. 11.0 to 4.3 ka.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782013","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":"Stranger in the nest: On the biostratigraphic relevance of a new record of a traversodontid cynodont in southern Brazil (Candelária Sequence, Upper Triassic)","authors":"Lívia Roese-Miron, Pedro Henrique Dotto, Thais Gotuzzo de Menezes Medina, Átila Augusto Stock Da-Rosa, Rodrigo Temp Müller, Leonardo Kerber","doi":"10.1016/j.palwor.2024.05.008","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.05.008","url":null,"abstract":"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 subzone of the AZ (mid-late Carnian) mainly due to the prevalent presence of the traversodontid — up to now the sole traversodontid discovered at the site. In this study, we report the first record of the traversodontid in the Várzea do Agudo site. The new specimen was excavated from the upper layers of the outcrop. Its identification as . 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 . , and two upper incisors — so far, a trait autapomorphic to the species among traversodontids. The age of the type locality of . has been a subject of debate. Whereas the -bearing sites had been associated with younger levels than those of the AZ, the absence of index fossils hampered proper biostratigraphic approaches. The finding of a . specimen in the same site as . 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 . . 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 -bearing sites could imply the existence of an intermediate fauna between this AZ and the subzone of the AZ, of which . 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.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"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":"Upper Ordovician conodonts from the Taoqupo section in the southwestern margin of the North China Craton","authors":"Shi-Xiao Li, Xiu-Chun Jing, Hong-Rui Zhou, Xun-Lian Wang, Yang Shen, Qiang Fang, Zhen-Tao Wang","doi":"10.1016/j.palwor.2024.06.004","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.06.004","url":null,"abstract":"A diverse but relatively low yielding conodont fauna has been recovered from the Yaoxian and the Taoqupo formations at the Taoqupo section, Tongchuan City, Shaanxi Province, North China. This conodont fauna comprises 20 species belonging to 12 genera, exhibiting a mixture of North China and North American Midcontinent provincial affinities, and with several pandemic species associated. Five stratigraphically important species are documented in detail. Among them, is revised as having a septimembrate apparatus. Five successive conodont biozones of late Sandbian to middle Katian age are recognized, namely the Biozone, the Biozone, the Biozone, the Biozone, and the Biozone, in ascending order. Some age-diagnostic and widely distributed conodonts present within the Taoqupo conodont fauna greatly facilitate a precise local, regional and international correlation of the present biozonation with coeval representative successions in North China, Northwestern China, South China, and the North American Midcontinent. Biostratigraphic correlations enable ages at the stage slice-level of the middle Sa2, the middle Sa2 to early Ka1, the middle Ka1, the late Ka1 to earliest Ka2, and the middle Ka2 to be assigned to the aforementioned five conodont biozones respectively.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781740","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":"“Out-of-India” dispersal of the extinct fabaceous genus Podocarpium Braun ex Stizenberger","authors":"Ashif Ali, Robert A. Spicer, Raman Patel, Rajendra Singh Rana, Mahasin Ali Khan","doi":"10.1016/j.palwor.2024.05.006","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.05.006","url":null,"abstract":"is a well-known extinct single-seeded legume genus having extensive Cenozoic fossil occurrences from East Asia to central Europe. To date, there have been no fossil records of this genus from South Asia, including India. Here, we report and describe for the first time a well-preserved fossil pod from the early Eocene of Rajasthan, western India, assigned to extinct based on detailed morphology. It is characterized by an asymmetrical, oblique valve with a single oblong seed, a distinctly curved stipe, a wingless margin, a prominent vascular strand along the dorsal suture that anastomoses into the apex, a weakly curved ventral suture, fine reticulate veins, a short acuminate apex, and a narrowly acute base. This discovery is the oldest fossil evidence of recorded to date worldwide. Together with previous fossil records, we suggest an “Out-of-India” dispersal hypothesis to explain the biogeography of this extinct legume genus. It might have originated under warm and humid tropical climate conditions in the early Eocene of India (South Asia), then migrated to China (East Asia), and subsequently spread north and westward to Europe.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141781737","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, Kui Wu, Zuoyu Sun, P. Martin Sander, A. Samathi, Yuan-Yuan Sun, Cheng Ji, V. Suteethorn, Jun Liu","doi":"10.1016/j.palwor.2024.07.004","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.07.004","url":null,"abstract":"","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-07-01","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, Mehmet Serkan Akkiraz, N. ÖZGEN-ERDEM, A. Nazik, F. Yaǧmurlu, Derya Sinanoğlu","doi":"10.1016/j.palwor.2024.07.003","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.07.003","url":null,"abstract":"","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-07-01","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":"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":null,"pages":null},"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}

{"title":"First record of the latest Devonian ostracods from Xainza region, Tibet, China: implications on palaeoenvironment and palaeobiogeography","authors":"Jun-Jun Song ,&nbsp;Wen Guo ,&nbsp;Yu-Cong Sun ,&nbsp;Juan Ma ,&nbsp;Jia-Yuan Huang ,&nbsp;Yi-Chun Zhang ,&nbsp;Wen-Kun Qie","doi":"10.1016/j.palwor.2022.01.002","DOIUrl":"10.1016/j.palwor.2022.01.002","url":null,"abstract":"<div><p>Ostracods of the Devonian–Carboniferous transitional interval in the Lhasa Block are described for the first time at the stratotype section of the Chaguoluoma Formation, Xainza, Tibet. Fifty-three ostracod species of 19 genera are identified and figured including a new species <em>Bairdiacypris xainzaensis</em> n. sp. The ostracod fauna in the Chaguoluoma section may represent an age close to the Devonian–Carboniferous boundary. The benthic ostracods from the Chaguoluoma section belong to the Podocopid association (i.e., Eifelian Mega-Assemblage), which implies an offshore environment. Additionally, ostracods from the Chaguoluoma Formation show a high similarity to the Devonian taxa from South China, suggesting a close biogeographic affinity between the Lhasa Block and South China Plate. They are also compared to the ostracod faunas from Laurentia–Baltica, Gondwana, and Kazakhstan plates, which implies that ostracods could probably benefit from oceanic circulations and sea-level changes to experience faunal exchanges between peri-Gondwana and Laurentia–Baltica during the latest Devonian.</p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43937861","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":"Zonation and biofacies of the Early Mississippian conodonts from Baoshan, Yunnan, Southwest China","authors":"Wen-Qi Wang,&nbsp;Xiang-Dong Wang,&nbsp;Ke-Yi Hu","doi":"10.1016/j.palwor.2023.03.010","DOIUrl":"10.1016/j.palwor.2023.03.010","url":null,"abstract":"<div><p>Early Mississippian Yudong and Shihuadong formations are well exposed in the Yudong I and Yudong II sections, Shidian, Baoshan, western Yunnan, Southwest China. Abundant and diverse conodonts are recovered from the two formations. A total of 29 species/subspecies belonging to 10 genera are identified. The <em>Siphonodella</em> and <em>Scaliognathus anchoralis</em>-<em>Gnathodus pseudosemiglaber</em> zones are recognized. Through cluster analysis, one conodont biofacies, <em>Polygnathus</em> biofacies, and two subbiofacies, <em>Bispathodus</em>-<em>Pseudopolygnathus</em> and <em>Gnathodus</em> subbiofacies, are identified. Changes in these conodont biofacies and subbiofacies are interpreted as a result of fluctuation of sea level in the Baoshan Block during the middle to late Tournaisian, Early Mississippian. <em>Geniculatus claviger</em> is recovered and systematically described in China for the first time.</p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55105961","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}