IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-09-12 DOI: 10.1016/j.palwor.2024.09.001

Lei Yang, Ben Yang, Yu-Ning Yang, Michael Steiner

引用次数: 0

Ginkgoites manchurica from the Lower Cretaceous Shahezi Formation of Liaoning, China, and its palaeoclimate implications 中国辽宁下白垩统沙河子地层中的银杏石及其古气候影响

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-08-30 DOI: 10.1016/j.palwor.2024.100876

Yan Liu, Qiao-Er Ying, Qi-Jia Li, Ning Zhou, Cao Zhang, Yu-Jin Zhang, Xiao Tan, Fei Liang

{"title":"Ginkgoites manchurica from the Lower Cretaceous Shahezi Formation of Liaoning, China, and its palaeoclimate implications","authors":"Yan Liu, Qiao-Er Ying, Qi-Jia Li, Ning Zhou, Cao Zhang, Yu-Jin Zhang, Xiao Tan, Fei Liang","doi":"10.1016/j.palwor.2024.100876","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.100876","url":null,"abstract":"The extreme greenhouse climate during the period of oceanic anoxic events (OAEs) in the Cretaceous is recognized based on marine stratigraphy, whereas the palaeoclimate remains poorly understood based on the terrestrial record due to the limitations of quantitative methods. The nearest living equivalent method, such as using the stomatal index of as a proxy, provides insight into reconstructing the terrestrial palaeoclimate during OAEs. However, due to the lack of well-preserved fossils with epidermal features and applicable quantitative methods, there are still controversies regarding the classification and nomenclature of species in the genus , which have been assigned to , , or . Here, we report well-preserved fossil leaves from the Lower Cretaceous Shahezi Formation in Changtu County, Liaoning Province, Northeast China. The fossil dry leaf mass per area (LMA) was estimated as a quantitative morphological and ecological proxy. The LMA results of 192–241 g/m for different specimens are very close, suggesting that these homonyms should be assigned to the same species. Therefore, combining the detailed epidermal features and a quantitative morphological proxy (LMA), we summarized and amended the previously described fossils into . Moreover, using the stomatal index of . , the palaeo-atmospheric CO concentration was calculated at 1270 ppmv using the Barclay SI-CO curve during the middle to late Aptian, indicating a typical greenhouse climate, which may be associated with the OAE global temperature increase event.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219066","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}

引用次数: 0

Albaillellarian (radiolaria) assemblages across the Guadalupian–Lopingian boundary (Permian) and their environmental implications 瓜达卢佩-洛平边界（二叠纪）Albaillellarian（放射虫）组合及其对环境的影响

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-08-26 DOI: 10.1016/j.palwor.2024.100875

Lei Zhang, Shan Chang, Xia Wang, Marie-Béatrice Forel, Qing-Lai Feng, Wei-Hong He, Taniel Danelian, Martial Caridroit, Qian Liu, Xing-Lin Li

{"title":"Albaillellarian (radiolaria) assemblages across the Guadalupian–Lopingian boundary (Permian) and their environmental implications","authors":"Lei Zhang, Shan Chang, Xia Wang, Marie-Béatrice Forel, Qing-Lai Feng, Wei-Hong He, Taniel Danelian, Martial Caridroit, Qian Liu, Xing-Lin Li","doi":"10.1016/j.palwor.2024.100875","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.100875","url":null,"abstract":"It remains unclear how radiolarian lineages adapted to the changing environments through the Guadalupian–Lopingian boundary (G-LB) interval. In this study, a well-preserved radiolarian fauna was obtained from silty cherts and siltstones deposited throughout the G-LB of the Sanpaoling, Yutouling, and Xiaqianling sections, located in Qinzhou City, Guangxi, China. Two genera of Albaillellaria, including ten species of and two species/morphotypes, are presented in this study. This assemblage is correlated with the Interval Zone. Based on the material obtained near the G-LB, the taxonomic value of pores on the test of species is here evaluated. This research documents a relatively significant morphological variation of the Albaillellarian lineages and an evolutionary reversal in through the G-LB. Based on the combination of the faunal and evolutionary response in the studied area, we suggest that the G-LB witnessed rapidly changing environmental conditions, imposing adaptive pressure on radiolarians, at least on the deep-dwelling Albaillellarians.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219067","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}

引用次数: 0

A new dichobunoid artiodactyl from the middle Eocene of Yunnan, China 来自中国云南中始新世的一种新的双足类有齿兽

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-08-26 DOI: 10.1016/j.palwor.2024.100874

Shi-Qi Wang, Xue-Ping Ji, Chun-Xia Zhang, Yi Wang, Guang-Ya Chen, Zhi-Guang Hu, Hui-Fang Yang

{"title":"A new dichobunoid artiodactyl from the middle Eocene of Yunnan, China","authors":"Shi-Qi Wang, Xue-Ping Ji, Chun-Xia Zhang, Yi Wang, Guang-Ya Chen, Zhi-Guang Hu, Hui-Fang Yang","doi":"10.1016/j.palwor.2024.100874","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.100874","url":null,"abstract":"Dichobunoids were the most basal artiodactyl group, widely distributed throughout the Eocene of Eurasia and North America, but were rarely reported from southern China. In this paper, we report the first dichobunoid artiodactyl, n. gen. n. sp., from the middle Eocene of Lunan Basin (Shilin County), China. is characterized by its relatively large size, bunoselenodont tooth morphology with a highly developed p4 metaconid, and a mesially interrupted paracristid formed by a weak premetacristid and a strong preprotocristid. This morphology distinguishes from all known dichobunoid artiodactyls. Within dichobunoids, resembles from the Eocene of Southeast Asia and “” from the Eocene of Shanxi, China, by the relatively large size, the absence of the paraconid, and the well-development of the hypolophid. However, still differs from and “” in the complete interruption of the paracristid and in the alignment of the entoconid and hypoconid as well as the protoconid and metaconiod. , , and “” might have derived from the Eocene from northern China, constituting a distinct group. The discovery of enhances our understanding of the early evolution of dichobunoid artiodactyls, especially in southern China.","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219077","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}

引用次数: 0

A new systematic study on Hystrix findings from eastern Aegean area 关于东爱琴海地区发现的 Hystrix 的新系统研究

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-08-19 DOI: 10.1016/j.palwor.2024.100873

Kazım Halaçlar, Berna Alpagut, Serdar Mayda, Tao Deng

引用次数: 0

The disappearance of European dirk-toothed cats 欧洲岩齿猫的消失

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-07-18 DOI: 10.1016/j.palwor.2024.05.003

Clàudia Tura-Poch, Saverio Bartolini-Lucenti, Qi-Gao Jiangzuo, Maria Prat-Vericat, Bienvenido Martínez-Navarro, Lorenzo Rook, Joan Madurell-Malapeira

引用次数: 0

Early Paleogene plant biomes of the Pacific side of Eurasia 古近纪早期欧亚大陆太平洋一侧的植物生物群落

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-07-17 DOI: 10.1016/j.palwor.2024.06.007

Olesia V. Bondarenko, Torsten Utescher

{"title":"Early Paleogene plant biomes of the Pacific side of Eurasia","authors":"Olesia V. Bondarenko, Torsten Utescher","doi":"10.1016/j.palwor.2024.06.007","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.06.007","url":null,"abstract":"Major plant biome changes in East Asia during the early Paleogene are studied using the Integrated Plant Record vegetation analysis for the first time based on paleobotanical records. The paleobotanical record employed for the reconstruction comprises 110 paleofloras covering the early Paleocene to early Eocene, a time-span of ca. 17 Myr. Our data indicate the presence of more forested conditions over East Asia during the early Paleogene than at present. The early Paleogene vegetation cover in the study area fundamentally differed from modern and was much more homogeneous compared to the modern one. Mixed mesophytic zonal vegetation dominated on the Pacific side of Eurasia during the early Paleogene. Thermophilous mixed mesophytic forests were distributed even at very high latitudes, but at the same time, ecotone between the mixed mesophytic / broadleaved evergreen forests and broadleaved evergreen forest were confined to regions south of 50°N. The proportions of sclerophyllous plants are low in general, even in the mid-latitudes. The localities with open woodlands are all located south of ca. 45°N. The observed vegetation patterns and their changes throughout the early Paleogene in many cases can be correlated with climate patterns and the overall continental paleoclimate evolution as reconstructed from the paleobotanical record. The higher-than-present spatial homogeneity of early Paleogene vegetation coincides with shallow temperature gradients and a significantly more humid regional rainfall pattern over East Asia during the early Paleogene.","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":"141782012","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}

引用次数: 0

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 双齿蜥趾甲上的大型双齿蜥趾甲附着结构：美国中洲东部辛辛那提拱地区志留纪棘皮动物的一种不常见的包壳关系

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-07-17 DOI: 10.1016/j.palwor.2024.07.001

James R. Thomka, Thomas E. Bantel, Donald L. Bissett, Drew A. Billups

{"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, Thomas E. Bantel, Donald L. Bissett, Drew A. Billups","doi":"10.1016/j.palwor.2024.07.001","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.07.001","url":null,"abstract":"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 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.","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":"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}

引用次数: 0

Taxonomy and evolutionary implications of a new fossil stonefly family (Insecta, Plecoptera) from Middle Cretaceous Kachin amber of northern Myanmar 缅甸北部中白垩世克钦邦琥珀中一个新的石蝇科化石（昆虫纲，褶翅目）的分类和进化意义

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-07-17 DOI: 10.1016/j.palwor.2024.06.002

Zhi-Teng Chen

引用次数: 0

Palaeoenvironmental implications of a turritelline-dominated assemblage from Upper Cretaceous carbonate rocks of Narmada Basin, India 印度纳尔马达盆地上白垩统碳酸盐岩中以绿松石为主的集合体对古环境的影响

IF 1.7 3区地球科学

Palaeoworld Pub Date : 2024-07-17 DOI: 10.1016/j.palwor.2024.06.003

Prantik Mondal, Arunaditya Das, Biplab Bhattacharya, Kalyan Halder

{"title":"Palaeoenvironmental implications of a turritelline-dominated assemblage from Upper Cretaceous carbonate rocks of Narmada Basin, India","authors":"Prantik Mondal, Arunaditya Das, Biplab Bhattacharya, Kalyan Halder","doi":"10.1016/j.palwor.2024.06.003","DOIUrl":"https://doi.org/10.1016/j.palwor.2024.06.003","url":null,"abstract":"Turritelline-dominated assemblages (TDAs) occur in modern siliciclastic seas within shallow depths, under normal to below normal salinity, high nutrient flux, high ocean upwelling current and/or runoff and cool water conditions. Similar assemblages in carbonate sediments are rare in modern oceans. However, TDA in carbonate rocks are common during the Cretaceous. In this study, we report the presence of a TDA in the late Turonian Nodular Limestone Formation of the Bagh Group, Narmada Basin, central India. An unusually small species of , . Halder, n. sp., is described from the TDA. The TDA, in terms of host rock microfacies and taphonomy, indicates shallow water to intertidal, low to moderate energy, eutrophic to mesotrophic conditions, that prevailed in restricted lagoonal to marginal lagoonal, back-reef environments. The turritellines, based on trace elements and Rare Earth Elements concentration, thrived under dysoxic conditions and experienced above-normal marine salinities. The preferences of modern TDAs do not fully represent such past ecological and lithological conditions, indicating an example of a non-uniformitarian shift in habitat.","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":"141781741","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}

引用次数: 0

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