Palaeoworld最新文献

{"title":"Unraveling the Early Devonian provenance of the Longmenshan region through detrital zircon records: Implications for floral differentiation in South China","authors":"Yan-Xiong Zhang ,&nbsp;Bo Zheng ,&nbsp;Xiao-Le Zhang ,&nbsp;Pu Huang","doi":"10.1016/j.palwor.2023.05.003","DOIUrl":"10.1016/j.palwor.2023.05.003","url":null,"abstract":"<div><p>The Longmenshan region is the geographical boundary between the Sichuan Basin and the eastern Tibetan Plateau, but whether it is the tectonic boundary between the Yangtze Block and Songpan-Garze terrane is still controversial. Meanwhile, the Early Devonian floral differentiation between the Longmenshan region and the southern part of the Yangtze Block, such as Yunnan and Guizhou provinces, also leads to controversy. Here we report U-Pb ages of detrital zircons from Lower Devonian sandstones of the Longmenshan region, providing evidence to discuss the tectonic affinity of the Longmenshan region and possible reasons for the Early Devonian floral differentiation. Detrital zircon U-Pb age patterns show that the Pingyipu Group defines three principal age populations of 2.6–2.4 Ga, 1.2–0.7 Ga, and 0.7–0.5 Ga, with two minor distributions of 1.8–1.5 Ga and 480–420 Ma. This U-Pb age spectrum is consistent with that of the Lower Devonian Danlin Formation of Guizhou, indicating that the Pingyipu Group and the Danlin Formation might share the same or similar sources. Together with fossil evidence, it is suggested that the Devonian sedimentary successions in the Longmenshan region are deposited in the western margin of the Yangtze Block, indicating the western boundary of this block is likely in somewhere to the west of Longmenshan fault, such as the Longriba fault. The Neoproterozoic strata located between the Longmenshan region and Yunnan–Guizhou provinces contain dominant Paleoproterozoic detrital zircons (2.1–1.9 Ga), however, this population is almost absent in the Pingyipu Group and the Danlin Formation, suggesting that there might not exist a denudation area (about 3000 masl) to supply sediments for Lower Devonian strata and separate the Longmenshan region and Guizhou. Therefore, the Early Devonian floral differentiation between the Longmenshan region and Yunnan–Guizhou provinces might not be caused by tectonic or mountainous barriers as previously suggested, but instead, might be caused by different depositional ages of the strata at a finer temporal resolution and environmental factors, such as different climatic conditions and/or habitat heterogeneity.</p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 570-583"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55106008","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":"Middle Ordovician shallow-water gastropods from southern Xizang (Tibet), China","authors":"Wen-Jie Li ,&nbsp;Xiang Fang ,&nbsp;Shen-Yang Yu ,&nbsp;Clive Burrett ,&nbsp;Yong Yi Zhen ,&nbsp;Jia-Yuan Huang ,&nbsp;Yuan-Dong Zhang","doi":"10.1016/j.palwor.2022.08.003","DOIUrl":"10.1016/j.palwor.2022.08.003","url":null,"abstract":"<div><p>Many new specimens (36 in total) of gastropods were collected from the Ordovician Alai Formation of the Chiatsun Group at Jiacun village, Nyalam County, southern Xizang (Tibet). These gastropods comprise five species assigned to two genera, including <em>Maclurites parviumbilicatus</em> Yu, <em>M</em>. cf. <em>nyalamensis</em> Yu, <em>M</em>. cf. <em>xizangensis</em> Yu, <em>M</em>. cf. <em>subconicus</em> Yu, and “<em>Hormotoma</em>” <em>ordosensis</em> Yu, forming a <em>Maclurites</em>-“<em>Hormotoma</em>” association. All the species are described in detail herein, and some of which are redefined. This fauna is of middle to late Darriwilian age, and palaeoecologically characterised by species of shallow-water within the photic zone. A comparison of the <em>Maclurites</em> community with the contemporary gastropod fauna from the Zhuozishan Formation exposed along the west margin of the North China Block shows a close palaeogeographical affinity. The occurrences of Ordovician gastropods from China are analyzed biogeographically and the results reveal that the peri-Gondwana gastropod faunal turnover event was initiated during the Middle to Late Ordovician transition. The coincident faunal turnover and the lithofacies changes in the Himalaya and western margin of North China suggest that tectonic activities and relative sea-level changes may account for the biogeographical affinities of some specific fossil groups in peri-Gondwanan regions.</p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 532-545"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41373454","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 Pennsylvanian rugose coral assemblage from eastern Junggar Basin, Northwest China","authors":"Sun-Rong Yang ,&nbsp;Le Yao ,&nbsp;Zhang-Shuai Hou ,&nbsp;Xun-Yan Ye ,&nbsp;Ying Li ,&nbsp;Xing Huang ,&nbsp;Shu-Zhong Shen ,&nbsp;Xiang-Dong Wang","doi":"10.1016/j.palwor.2022.12.009","DOIUrl":"10.1016/j.palwor.2022.12.009","url":null,"abstract":"<div><p><span>The Pennsylvanian rugose corals are not well understood in Northwest China due to their low diversity and restricted distribution under the impact from coeval Gondwana glaciation. In this study, nine rugose coral species of eight genera are described from the Shiqiantan and Jingou formations (Moscovian to Kasimovian stages) in the new Shuangjingzi Section, northern Xinjiang, Northwest China. These species include dissepimented solitary rugose corals (</span><em>Arctophyllum shuangjingziense</em> n. sp., <em>Arctophyllum intermedium</em>, <em>Caninophyllum ürümqiense</em>, <em>Gshelia qitaiensis</em>, <em>Pseudotimania</em> aff. <em>junggarensis</em>, <em>Pseudozaphrentoides paramapingensis</em>), and non-dissepimented solitary corals (<em>Amplexizaphrentis</em> sp., <em>Bradyphyllum bellicostatum</em> and <em>Hapsiphyllum</em> sp.). This coral assemblage includes local taxa of the Junggar Basin, with a few common elements from Urals Mountains, Novaya Zemlya, and Spitsbergen in northwestern Palaeotethys Ocean. The composition of the Shuangjingzi corals is characterized by the medium-large dissepimentarium <em>Caninophyllum ürümqiense</em>-<em>Gshelia qitaiensis</em> assemblage, indicating open shallow carbonate environments. Compared with the Shiqiantan Formation, the obvious increase in the abundance of narrow-dissepimentarium corals of <em>Gshelia</em> in the upper Jingou Formation, implies that low-energy environments could have developed, with an increase of shales in this interval.</p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 650-663"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45183202","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":"New sauropod remains from the Middle Jurassic Dongdaqiao Formation of Qamdo, eastern Tibet","authors":"Xue-Fang Wei ,&nbsp;Qi-Yu Wang ,&nbsp;Xian-Yin An ,&nbsp;Bao-Di Wang ,&nbsp;Yu-Jie Zhang ,&nbsp;Chuang-Long Mou ,&nbsp;Yong Li ,&nbsp;Dong-Bing Wang ,&nbsp;Waisum Ma ,&nbsp;Martin Kundrát","doi":"10.1016/j.palwor.2023.02.002","DOIUrl":"10.1016/j.palwor.2023.02.002","url":null,"abstract":"<div><p><span>We report isolated postcranial materials newly excavated from the Middle Jurassic Dongdaqiao Formation in Chaya County, Qamdo City, eastern </span>Tibet. The specimens are assignable to Eusauropoda based on the following combination of characters: huge size of caudal vertebrae and humeral shaft, weakly developed amphicoelous caudal centrum, femoral distal ends with two condyles and a shallow intercondylar groove, and rod-like transverse process of the anterior caudal vertebra with its base not extending to the neural arch. Due to the fragmentary nature of the specimens, we refrain from assigning them to lower taxonomic levels or new species of sauropod until more complete materials are excavated from Qamdo. Nevertheless, the new materials from Qamdo demonstrate that some gigantic sauropods migrated to eastern Tibet during the Middle Jurassic and were more widely distributed than previously known.</p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 744-752"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55105895","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":"Preface: Fossils and strata from the Qinghai-Xizang (Tibet) Plateau and adjacent regions","authors":"Yi-Chun Zhang,&nbsp;Wen-Kun Qie,&nbsp;Xin Li,&nbsp;Ke-Yi Hu","doi":"10.1016/j.palwor.2024.05.002","DOIUrl":"10.1016/j.palwor.2024.05.002","url":null,"abstract":"","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 527-531"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141029694","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":"New material of heteromorph ammonites from the Lower Cretaceous of Lhozhag County, southern Tibet and its biostratigraphic implications","authors":"Cheng Ji ,&nbsp;Wangjiu Mima ,&nbsp;Danzeng Awang ,&nbsp;Bo Xu","doi":"10.1016/j.palwor.2023.06.004","DOIUrl":"10.1016/j.palwor.2023.06.004","url":null,"abstract":"<div><p><span><span>Cretaceous ammonites are still poorly known in </span>Tibet, western China. Here we describe a new heteromorph ammonite fauna from the Lower Member of the Lakang Formation in the Lhozhag County, southern Tibet. Material of at least five genera are recognized, including </span><em>Aspinoceras</em>, ? <em>Hemihoplites</em>, Heteroceratidae gen. et sp. indet, ? <em>Mortoniceras</em> and <em>Parancyloceras</em><span><span>, among which three genera are reported from this area for the first time. This ammonite fauna indicates that the age of the Lakang Formation is approximately late Hauterivian to </span>Albian (Early Cretaceous). This study proves that the Lakang Formation was not contemporaneous with the adjacent Gamba Group, which is slightly younger, different from a previous interpretation.</span></p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 768-776"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47634167","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 foraminiferal fauna from the Tangra Yumco area, central Lhasa Block, Tibet and its palaeobiogeographic implications","authors":"Qi Ju ,&nbsp;Yi-Chun Zhang ,&nbsp;Hai-Peng Xu ,&nbsp;Hua Zhang ,&nbsp;Quan-Feng Zheng ,&nbsp;Mao Luo ,&nbsp;Wen-Kun Qie ,&nbsp;Jun-Jie Liu ,&nbsp;Shu-Zhong Shen","doi":"10.1016/j.palwor.2023.06.005","DOIUrl":"10.1016/j.palwor.2023.06.005","url":null,"abstract":"<div><p>A foraminiferal fauna, consisting of 8 species of fusulines and 24 species of smaller foraminifers, is reported from the middle part of the Xiala Formation in the Tangra Yumco section in central Lhasa Block. The dominance of fusuline <em>Nankinella</em>-<em>Chusenella</em> assemblage and smaller foraminifera <em>Hemigordiopsis</em><span> indicates a Capitanian (late Guadalupian) age. Quantitative methods including Cluster analysis (CA) and Non-metric Multidimensional Scaling (NMDS) are employed to explore the palaeobiogeographic relationship among the Lhasa, South Qiangtang, Baoshan and Tengchong blocks as well as the localities within these blocks, based on a compilation of Guadalupian fusulines from the four blocks. Results of CA and NMDS for the Guadalupian fusulines from twelve localities show that different localities in the Lhasa Block have a close palaeobiogeographic relationship, indicating a unified environment for the whole Lhasa Block during the Guadalupian. Results of CA and NMDS from four blocks show that the Lhasa and Tengchong blocks have a closer relationship in palaeobiogeographic characteristics, whereas the South Qiangtang and Baoshan blocks are relatively closer. All these results indicate that the Mesotethys Ocean might have opened to a considerable width, forming a palaeogeographic barrier to allow for the discrepancy of palaeobiogeographic characteristics between the Lhasa-Tengchong and the South Qiangtang-Baoshan blocks.</span></p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 3","pages":"Pages 724-743"},"PeriodicalIF":1.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41648007","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":"Gigantic gastropods from the Middle Triassic Qingyan biota of Guizhou","authors":"","doi":"10.1016/j.palwor.2024.05.001","DOIUrl":"10.1016/j.palwor.2024.05.001","url":null,"abstract":"<div><p><span><span>Body sizes of organisms underpin their ecological functions and evolutionary trajectories. Previous studies have shown that significant reduction in body size — the Lilliput effect — occurred in the aftermath of the Permian–Triassic mass extinction (PTME) and that body size did not rebound until to the late </span>Middle Triassic (Ladinian). Here we describe three new gastropod specimens, identified as </span><em>Toxoconcha</em><span> sp., with unprecedented large shell sizes among Triassic gastropods, from the Qingyan biota of Guizhou, China. Meanwhile, a new dataset on the gastropod size of Lopingian (Late Permian) to Middle Triassic is presented. The largest specimen we found is ∼350 mm in height while its shell volume is estimated to be 1358661 (= 6.13 log</span>₁₀) mm³<span>. As the largest record of the Triassic gastropod shells, these new fossils<span> from Qingyan suggest that gastropod body size rebounded from the post-PTME Lilliput effect as early as the Anisian. Rapid gigantism has been reported in Middle Triassic marine reptiles, and the occurrence of giant gastropods in Qingyan suggests a convergent morphological response to the unique ecological and environmental conditions of the Middle Triassic.</span></span></p></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 5","pages":"Pages 1425-1434"},"PeriodicalIF":1.7,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141024850","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 penguin fossil from Seymour Island and reassessment of taxonomy and diversity of Eocene Antarctic penguins","authors":"","doi":"10.1016/j.palwor.2024.04.007","DOIUrl":"10.1016/j.palwor.2024.04.007","url":null,"abstract":"<div><div><span>Eocene<span> penguins from Seymour Island play an important role in studies related to the taxonomy and evolution of the Sphenisciformes stem group. Among these penguins, the </span></span><em>Palaeeudyptes</em><span><span><span> species are particularly noteworthy for their unusually large size and the contentious nature of their classification criteria. In this study, we describe a new penguin skeleton with a well-preserved tarsometatarsus discovered in the Upper Eocene of Seymour Island, </span>Antarctica. The new </span>fossil exhibits tarsometatarsal characteristics of </span><em>Palaeeudyptes</em> but differs from two species of <em>Palaeeudyptes</em> previously found on Seymour Island, providing insights on the morphological diversity and evolutionary history of early penguins. We conduct normality and unimodality tests on <em>Palaeeudyptes</em><span> taxa from Seymour Island to reassess the hypothesis that size differences between the two species of this genus could be attributed to sexual dimorphism in a single species. The results revealed that size differences are unlikely due to sexual dimorphism. We also use the linear discriminant analysis to evaluate the taxonomic criteria for the two </span><em>Palaeeudyptes</em> species discovered in the Antarctic region. The data showed an overlap in the size distribution, indicating weakness in the classification criteria. Reassessing previous samples and establishing an additional diagnosis based on critical anatomical features could potentially resolve this issue.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 6","pages":"Pages 1668-1680"},"PeriodicalIF":1.7,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140933444","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":"Cheirocystis liexiensis, a new rhombiferan blastozoan (Echinodermata) from Lower Ordovician of South China Block","authors":"","doi":"10.1016/j.palwor.2024.04.005","DOIUrl":"10.1016/j.palwor.2024.04.005","url":null,"abstract":"<div><div><span>Rhombiferan (Echinoderm) fossils<span> from the Lower Ordovician Liexi fauna in the South China Block are identified as </span></span><em>Cheirocystis liexiensis</em><span> n. sp. Details of the stem, theca and brachioles are preserved. </span><em>Cheirocystis liexiensis</em><span> is characterized by plates with single axial ridges and outer proximal stem ossicles with two smooth annular flanges, the lower curved downwards. The earliest Cheirocrinidae in the South China Block was from the Tremadocian in Jiangnan Slope, then migrated to the margin of Jiangnan Slope during Floian, and finally to the intra-platform during Middle–Upper Ordovician. Spatial-temporal distribution of the cheirocrinid fossils throughout the Lower to Upper Ordovician units in the South China suggests probably a slow westward biogeographic migration of cheirocrinids. Newly discovered Lagerstätten, such as the Liexi fauna, allow tests of geographical bias in our knowledge of the fossil record. Such testing should become routine.</span></div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"33 6","pages":"Pages 1505-1514"},"PeriodicalIF":1.7,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140778832","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}