Chondrichthyans from the Lower Clayton Limestone Unit of the Midway Group (Paleocene) near Malvern, Arkansas, USA, with comments on the K/Pg boundary

Chondrichthyans from the Lower Clayton Limestone Unit of the Midway Group (Paleocene) near Malvern, Arkansas, USA, with comments on the K/Pg boundary
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来自美国阿肯色州马尔文附近中途岛群(古新世)下克莱顿石灰岩单元的软骨鱼,以及对 K/Pg 边界的评论

DOI:
10.1007/s12542-019-00494-7
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发表时间:
2019
期刊:
影响因子:
1.8
通讯作者:
Griffiths, Michael L.
Griffiths, Michael L.
中科院分区:
地球科学4区
文献类型:
--
作者:
Maisch, Harry M.;Becker, Martin A.;Griffiths, Michael L.

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美国阿肯色州马尔文附近中途岛群(古新统)的下克莱顿石灰岩单元(LCLU)包含一个最近因公路稳定性挖掘而暴露的软骨鱼类组合。该组合中的软骨鱼类牙齿至少属于12个分类群,包括:Ginglymostoma subafricanum,Carpellascf.whitei,Carpellassp.,Odontaspis winkleri,Palaeohotodus rutori,Palaeogaleus vincenti,Dasyatiscf.hexagonalis,Dasyatissp.,Hypolophitesp.,Myliobatissp.,Rhinopterasp.和一个不确定的嵌合体在当地,这些软骨鱼类出现在一个地层剖面内,直接位于白垩纪-古近纪(K/Pg)边界之上,该边界也包含软骨鱼类。这种情况在全球化石记录中并不常见,并提供了一个机会:(1)评估马尔文地区和阿肯色州西南部墨西哥湾沿岸平原K/Pg边界的软骨鱼多样性;(2)评估距离墨西哥希克苏鲁布1500公里处K/Pg撞击点附近边缘至浅海软骨鱼动物群更替和灭绝的时间。这K/Pg地层剖面内观察到的模式表明,软骨鱼类组合的变化主要是海平面周期性和栖息地损失,发生在几百万年的结果。
The Lower Clayton Limestone Unit (LCLU) of the Midway Group (Paleocene) near Malvern, Arkansas, USA contains an assemblage of chondrichthyans recently exposed by excavation for highway stabilization. Chondrichthyan teeth in this assemblage belong to at least 12 taxa including:Ginglymostoma subafricanum,Carchariascf.whitei,Carchariassp.,Odontaspis winkleri,Palaeohypotodus rutori,Palaeogaleus vincenti,Dasyatiscf.hexagonalis,Dasyatissp.,Hypolophitessp.,Myliobatissp.,Rhinopterasp., and an indeterminate chimaerid. Locally, these chondrichthyans occur within a stratigraphic section directly above the Cretaceous–Paleogene (K/Pg) boundary that also contains chondrichthyans. This occurrence is uncommon in the global fossil record and provides an opportunity to (1) assess chondrichthyan diversity across the K/Pg boundary in the Malvern region and Gulf Coastal Plain of southwestern Arkansas and (2) evaluate the timing of marginal to shallow marine chondrichthyan faunal turnover and extinction at a proximal location ≈ 1500 km from the Chicxulub, Mexico, K/Pg impact site. Observed patterns within this K/Pg stratigraphic section indicate that changes in chondrichthyan assemblages are primarily the result of sea-level cyclicity and habitat losses that occurred across several million years.
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