{"title":"Geology, microstratigraphy, and paleontology of the lacustrine Truckee Formation diatomite deposits near Hazen, Nevada, USA, with emphasis on fossil stickleback fish","authors":"J. N. Cerasoni, Michael A. Bell, Y. Stuart","doi":"10.5070/p941161500","DOIUrl":"https://doi.org/10.5070/p941161500","url":null,"abstract":"","PeriodicalId":477091,"journal":{"name":"PaleoBios","volume":" 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140999562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new naticid gastropod, Euspira? louiemarincovichi n. sp., is described from the Pliocene to Pleistocene age Gubik Formation on the North Slope of Alaska between Skull Cliff in the west and the Kogru River/Teshekpuk Lake area in the east. It is easily distinguished from all other Atlantic, Pacific and Arctic oceans naticids by its fine radial and somewhat stronger spiral ribs. This new species lived during a time when water temperatures were warmer in the Arctic than today based on the occurrence of the gastropod genus Littorina with which this new species co–occurs. As such, Euspira? louiemarincovichi likely lived in the upper intertidal zone on hard substrate and were not present where sea–ice impinges on the shoreline. Based on co–occurrences of extinct species and the temperature regime indicated by Littorina, of significantly warmer temperatures, and some associated species, this new species probably lived during the Bigbendian and (or) Fishcreekian marine transgressions, or between about 2.5 and 2.1 Ma, which is the Gelasian Stage of the early Pleistocene.
一种新的酸性腹足动物，尤匹拉?louiemarincovichi n. sp.，描述了阿拉斯加北坡西部的Skull Cliff和东部的Kogru河/Teshekpuk湖地区之间上新世至更新世的Gubik组。它很容易与所有其他大西洋、太平洋和北极海洋的鲷鱼区分开来，因为它有精细的放射状和稍强的螺旋状肋骨。这个新物种生活在北极水温比现在高的时期，这是基于与这个新物种共存的腹足类动物Littorina的出现。因此，尤斯皮拉?louimarincovichi可能生活在坚硬的潮间带上，不存在海冰冲击海岸线的地方。根据已灭绝物种的共同出现和Littorina所显示的明显更温暖的温度体系以及一些相关物种，该新物种可能生活在Bigbendian和(或)fishcreek海侵期间，或大约2.5 - 2.1 Ma之间，即早更新世的Gelasian阶段
{"title":"A new fossil <i>Euspira</i>? (Mollusca: Gastropoda: Naticidae) from the Gubik Formation on the North Slope of Arctic Alaska","authors":"Charles L. Powell, II, Ashley A. Dineen","doi":"10.5070/p9401557134","DOIUrl":"https://doi.org/10.5070/p9401557134","url":null,"abstract":"A new naticid gastropod, Euspira? louiemarincovichi n. sp., is described from the Pliocene to Pleistocene age Gubik Formation on the North Slope of Alaska between Skull Cliff in the west and the Kogru River/Teshekpuk Lake area in the east. It is easily distinguished from all other Atlantic, Pacific and Arctic oceans naticids by its fine radial and somewhat stronger spiral ribs. This new species lived during a time when water temperatures were warmer in the Arctic than today based on the occurrence of the gastropod genus Littorina with which this new species co–occurs. As such, Euspira? louiemarincovichi likely lived in the upper intertidal zone on hard substrate and were not present where sea–ice impinges on the shoreline. Based on co–occurrences of extinct species and the temperature regime indicated by Littorina, of significantly warmer temperatures, and some associated species, this new species probably lived during the Bigbendian and (or) Fishcreekian marine transgressions, or between about 2.5 and 2.1 Ma, which is the Gelasian Stage of the early Pleistocene. ","PeriodicalId":477091,"journal":{"name":"PaleoBios","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135726069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elisabeth A. Wheeler, Steven R. Manchester, Pieter Baas
Well-preserved silicified woods are common in the Pacific Northwest, USA. Localities near the town of Post, Oregon, provide insights into the late Eocene vegetation and climate ca. 36 million years ago and data for comparing both older and younger wood floras of the region. New investigations of the late Eocene Dietz Hill locality (UF 278) revealed woods belonging to the families Pinaceae (Keteleeria farjonii sp. nov.), Cupressaceae (Taxodioxylon sp.), Magnoliaceae (Magnolia hansnooteboomii sp. nov.), Lauraceae (Laurinoxylon sp. A and B), Platanaceae (Platanoxylon haydenii (Felix) Süss and Müller-Stoll, 1977), Fabaceae (cf. Styphonolobium sp.), Fagaceae (Fagus dodgei Wheeler and Manchester, 2021, Quercus sp., Red Oak type), Juglandaceae (Carya leroyii sp. nov.), Ulmaceae (Ulmus woodii Wheeler and Manchester, 2007), Sapindaceae (Aesculus constabularisii sp. nov., Klaassenoxylon wilkinsonii gen. et sp. nov.), and Araliaceae (Plerandreoxylon oskolskii sp. nov.). Some woods could be assigned to order, but not to family, Rosales (Urticaleoxylon stevensii gen. et sp. nov., and two unnamed woods with features of Cannabaceae and Moraceae), Sapindales (cf. Fagaroxylon sp.). There also is a Hamamelidoxylon sp., which has features found in both the Theaceae and Hamamelidaceae. These woods, together with taxa identified from co-occurring silicified fruits and seeds represent a diverse assemblage of warm temperate to subtropical woody plants, some with East Asian affinities. Comparing the wood functional traits of the Dietz Hill assemblage to the older Clarno Nut Beds (mid-Eocene) woods and to the younger woods associated with Oligocene Bridge Creek flora attests to increased seasonality and cooling climate.
{"title":"A late Eocene wood assemblage from the Crooked River Basin, Oregon, USA","authors":"Elisabeth A. Wheeler, Steven R. Manchester, Pieter Baas","doi":"10.5070/p9401462457","DOIUrl":"https://doi.org/10.5070/p9401462457","url":null,"abstract":"Well-preserved silicified woods are common in the Pacific Northwest, USA. Localities near the town of Post, Oregon, provide insights into the late Eocene vegetation and climate ca. 36 million years ago and data for comparing both older and younger wood floras of the region. New investigations of the late Eocene Dietz Hill locality (UF 278) revealed woods belonging to the families Pinaceae (Keteleeria farjonii sp. nov.), Cupressaceae (Taxodioxylon sp.), Magnoliaceae (Magnolia hansnooteboomii sp. nov.), Lauraceae (Laurinoxylon sp. A and B), Platanaceae (Platanoxylon haydenii (Felix) Süss and Müller-Stoll, 1977), Fabaceae (cf. Styphonolobium sp.), Fagaceae (Fagus dodgei Wheeler and Manchester, 2021, Quercus sp., Red Oak type), Juglandaceae (Carya leroyii sp. nov.), Ulmaceae (Ulmus woodii Wheeler and Manchester, 2007), Sapindaceae (Aesculus constabularisii sp. nov., Klaassenoxylon wilkinsonii gen. et sp. nov.), and Araliaceae (Plerandreoxylon oskolskii sp. nov.). Some woods could be assigned to order, but not to family, Rosales (Urticaleoxylon stevensii gen. et sp. nov., and two unnamed woods with features of Cannabaceae and Moraceae), Sapindales (cf. Fagaroxylon sp.). There also is a Hamamelidoxylon sp., which has features found in both the Theaceae and Hamamelidaceae. These woods, together with taxa identified from co-occurring silicified fruits and seeds represent a diverse assemblage of warm temperate to subtropical woody plants, some with East Asian affinities. Comparing the wood functional traits of the Dietz Hill assemblage to the older Clarno Nut Beds (mid-Eocene) woods and to the younger woods associated with Oligocene Bridge Creek flora attests to increased seasonality and cooling climate.","PeriodicalId":477091,"journal":{"name":"PaleoBios","volume":"22 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135221171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two new species of the rare mosasaur Ectenosaurus are reported from the Upper Cretaceous of North America. Ectenosaurus tlemonectes sp. nov. (YPM VP4673) consists of a largely complete skull and some associated post-cranial elements that were derived from an unknown level within the Smoky Hill Member of the Niobrara Chalk (upper Coniacian-lower Campanian), of Kansas, USA. Ectenosaurus shannoni sp. nov. (ALMNH:Paleo:5452) is described from a much more fragmentary specimen collected from the unnamed member of the Mooreville Chalk (upper Santonian-lower Campanian) of Alabama, USA. These new taxa can be distinguished from the other members of the genus, E. clidastoides (Merriam, 1894) and E. everhartorum Willman et al. (2021), by clear morphological differences in the skull and jaws. Two parsimony analyses of a data matrix consisting of 98 characters and 20 terminal taxa were carried out, the first without constraints and the second constrained by the assumption of monophyly in Ectenosaurus. Both analyses resulted in 30 equally parsimonious trees of 255 steps. Neither analysis yielded definitive information about the position of Ectenosaurus within Plioplatecarpinae, suggesting the need for an expanded data matrix. Although Ectenosaurus is an extremely rare component of the mosasaur assemblages from which it is found, it is also a diverse genus, with now at least four recognized species. This raises questions about the paleoecology and paleobiogeography of this genus and requires additional investigation.
{"title":"Two new plioplatecarpine mosasaurs (Mosasauridae; Plioplatecarpinae) of the genus <i>Ectenosaurus</i> from the Upper Cretaceous of North America","authors":"Caitlin R. Kiernan, Jun A. Ebersole","doi":"10.5070/p9401362375","DOIUrl":"https://doi.org/10.5070/p9401362375","url":null,"abstract":"Two new species of the rare mosasaur Ectenosaurus are reported from the Upper Cretaceous of North America. Ectenosaurus tlemonectes sp. nov. (YPM VP4673) consists of a largely complete skull and some associated post-cranial elements that were derived from an unknown level within the Smoky Hill Member of the Niobrara Chalk (upper Coniacian-lower Campanian), of Kansas, USA. Ectenosaurus shannoni sp. nov. (ALMNH:Paleo:5452) is described from a much more fragmentary specimen collected from the unnamed member of the Mooreville Chalk (upper Santonian-lower Campanian) of Alabama, USA. These new taxa can be distinguished from the other members of the genus, E. clidastoides (Merriam, 1894) and E. everhartorum Willman et al. (2021), by clear morphological differences in the skull and jaws. Two parsimony analyses of a data matrix consisting of 98 characters and 20 terminal taxa were carried out, the first without constraints and the second constrained by the assumption of monophyly in Ectenosaurus. Both analyses resulted in 30 equally parsimonious trees of 255 steps. Neither analysis yielded definitive information about the position of Ectenosaurus within Plioplatecarpinae, suggesting the need for an expanded data matrix. Although Ectenosaurus is an extremely rare component of the mosasaur assemblages from which it is found, it is also a diverse genus, with now at least four recognized species. This raises questions about the paleoecology and paleobiogeography of this genus and requires additional investigation.","PeriodicalId":477091,"journal":{"name":"PaleoBios","volume":"57 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135365931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Charles L. Powell, II, Barry Roth, Christine N. Garcia
{"title":"Nucella demouthae, A New Late Miocene Muricid Gastropod From Northern California, U.S.A.","authors":"Charles L. Powell, II, Barry Roth, Christine N. Garcia","doi":"10.5070/p9411257951","DOIUrl":"https://doi.org/10.5070/p9411257951","url":null,"abstract":"","PeriodicalId":477091,"journal":{"name":"PaleoBios","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135857333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：