安大略省汉密尔顿漩涡组(奥陶世晚期，Hirnantian)的珊瑚和头足类:生物地层学和生物地理学意义

IF 1.3 4区地球科学 Q3 PALEONTOLOGY

Journal of Paleontology Pub Date : 2023-09-28 DOI:10.1017/jpa.2023.53

Robert J. Elias, Roger A. Hewitt

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引用次数: 0

摘要

摘要:在安大略省南部汉密尔顿的惠而浦组近岸浅海砂岩中，发现了属于rutkae Streptelasma n. sp.的孤独熊珊瑚和一种被鉴定为Gorbyoceras sp.的环状正锥头足类动物。它们是有助于现代理解该地层单位的年龄和对比的第一批大型化石。鲁特氏链霉与S。亚规则层(Savage, 1913)，广泛分布于美国中东部的Edgewood省，被认为是奥陶纪晚期的地层(Hirnantian)。在辛辛那提拱门地区，戈比瓷分布在最新的卡蒂亚(最新的里奇蒙德)。因此，S。rutkae和Gorbyoceras sp.支持其他生物地层学和化学地层学数据，表明漩涡组是最晚的奥陶纪，而不是传统认为的最早的志留纪。它们还表明了安大略省惠而浦沉积区与美国中东部的埃奇伍德省和辛辛那提拱门地区之间的古地理联系UUID: http://zoobank.org/d1ded814-204d-4070-a469-52d3b6e259c7

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Corals and a cephalopod from the Whirlpool Formation (latest Ordovician, Hirnantian), Hamilton, Ontario: biostratigraphic and biogeographic significance

Abstract Solitary rugose corals assigned to Streptelasma rutkae n. sp. and an annulated orthoconic cephalopod identified as Gorbyoceras sp. occur in nearshore shallow-marine sandstone of the Whirlpool Formation in Hamilton, southern Ontario. They are the first macrofossils contributing to a modern understanding of the age and correlation of this stratigraphic unit. Streptelasma rutkae most closely resembles S . subregulare (Savage, 1913), which occurs widely in the Edgewood Province of the east-central United States, in strata considered latest Ordovician (Hirnantian). Gorbyoceras ranges into the latest Katian (latest Richmondian) in the Cincinnati Arch region. Thus, the occurrences of S . rutkae and Gorbyoceras sp. support other biostratigraphic and chemostratigraphic data suggesting that the Whirlpool Formation is latest Ordovician, rather than earliest Silurian as traditionally thought. They also indicate paleogeographic connections between the area of Whirlpool deposition in Ontario and the Edgewood Province and Cincinnati Arch region in the east-central United States UUID: http://zoobank.org/d1ded814-204d-4070-a469-52d3b6e259c7

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来源期刊

Journal of Paleontology 地学-古生物学

CiteScore

2.80

自引率

7.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Paleontology publishes original articles and notes on the systematics, phylogeny, paleoecology, paleogeography, and evolution of fossil organisms. It emphasizes specimen-based research and features high quality illustrations. All taxonomic groups are treated, including invertebrates, microfossils, plants, vertebrates, and ichnofossils.