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Microvertebrates from the Rhaetian basal bone bed of Saltford, near Bath, SW England
Proceedings of the Geologists' Association ( IF 1.2 ) Pub Date : 2021-01-06 , DOI: 10.1016/j.pgeola.2020.11.003
Matthieu Moreau , Christopher J. Duffin , Claudia Hildebrandt , Deborah Hutchinson , Adam Parker , Simon Carpenter , Michael J. Benton

The famous Rhaetian bone bed (Late Triassic, 205 Ma) is well known because it marks a major switch in depositional environment from terrestrial red beds to fully marine conditions throughout the UK and much of Europe. The bone bed is generally cemented and less than 10 cm thick. However, we report here an unusual case from Saltford, near Bath, S.W. England where the bone bed is unconsolidated and up to nearly 1 m thick. The exposure of the basal beds of the Westbury Formation, Penarth Group includes a bone bed containing a diverse Rhaetian marine microvertebrate fauna dominated by sharks, actinopterygian fishes and reptiles. Despite the unusual sedimentary character of the bone bed, we find similar proportions of taxa as in other basal Rhaetian bone beds (55–59 % Lissodus teeth, 13–16 % Rhomphaiodon teeth, 12–14 % Severnichthys teeth, 6–9% Gyrolepis teeth, 3–4% undetermined sharks’ teeth, 1–3% undetermined bony fish teeth, and < 1% of each of Hybodus, Parascylloides, and Sargodon), the only differences being in the proportions of Rhomphaiodon teeth, which can represent 30–40 % of specimens elsewhere. This suggests that taphonomic bias of varying Rhaetian bone beds may be comparable despite different sedimentary settings, and that the proportions of taxa say something about their original proportions in the ecosystem.



中文翻译:

英国西南部巴斯附近的Saltford Rhaetian基骨床的微脊椎动物

著名的Rhaetian骨床(三叠纪晚期,205 Ma)是众所周知的,因为它标志着沉积环境从陆地红层到英国乃至欧洲大部分地区的完全海洋条件的重大转变。骨床通常是胶合的,厚度小于10厘米。但是,我们在这里报道了英格兰西南部巴斯附近的萨尔特福德的一个不寻常的案例,那里的骨床没有被巩固并且厚达近1 m。Penarth Group Westbury组基床的裸露包括一个骨床,其中包含以鲨鱼,放线翅目鱼类和爬行动物为主的各种Rhaetian海洋微脊椎动物。尽管骨床具有不同寻常的沉积特征,但我们发现其类群的比例与其他基础Rhaetian骨床相同(55-59%的Lissodus牙齿,13-16%的牙齿)菱形齿,12–14%的Severnichthys齿,6–9%的Gyrolepis齿,3–4%的未定鲨鱼齿,1-3%的未定骨鱼齿以及HybodusParascylloidesSargodon中的每一个<1%),唯一的区别在于菱形牙齿的比例,它可以代表其他地方标本的30–40%。这表明尽管沉积环境不同,但不同Rheatian骨床的拓朴学偏差仍可比较,而分类单元的比例也说明了它们在生态系统中的原始比例。

更新日期:2021-01-06
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