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首页> 外文期刊>Michigan Academician >Paleocene Turtles and Crocodilians Directly Above the Cretaceous/Tertiary (K/T) Boundary in Pulaski County, Illinois
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Paleocene Turtles and Crocodilians Directly Above the Cretaceous/Tertiary (K/T) Boundary in Pulaski County, Illinois

机译：伊利诺伊州普拉斯基县白垩纪/第三纪（K / T）边界正上方的古新世海龟和鳄鱼

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摘要

During the earliest part of the Paleocene (DanianAge), the Mississippi Embayment extended into southern Illinois. Recently, fossils from this interval were found immediately above the K/T (Cretaceous/Tertiary) boundary in the Clayton Formation near Olmsted, Pulaski County, Illinois. Bryozoans, gastropods, and pelecypods dominate the fauna, and sharks are common. Rare fossils include annelid worms, crabs, a spiny lobster, a ratfish, a ray, a few bony fishes, and the reptiles reported here. Reptiles have not been previously reported from the Paleocene or Eocene of any state or province bordering the Great Lakes. Moreover, all reptiles reported here represent survivors of the massive extinction of the dinosaurs and great sea reptiles at the end of the Cretaceous. Turtles are represented by remains of a large sea turtle of the modern genus Chelonia and a softshell turtle assigned to cf. Trionyx, a modern genus of the family Trionychidae; a small crocodilian is also represented. Previously, the Clayton fauna was said to represent a near shore brackish to nearly marine environment. Based on the Clayton reptiles, one can further refine this interpretation by suggesting a riverine, coastal environment in a semitropical or tropical climate.
机译：在古新世（DanianAge）的最早时期，密西西比河沿岸扩展到伊利诺伊州南部。最近，在伊利诺伊州普拉斯基县奥尔姆斯特德附近的克莱顿组的克莱顿岩层的K / T（白垩纪/第三纪）界线正上方发现了这一间隔的化石。浮游动物，腹足动物和长脚类动物占主导地位，鲨鱼很常见。稀有的化石包括nel虫，螃蟹，多刺的龙虾，fish鱼，a鱼，一些骨鱼和此处报道的爬行动物。以前从未与大湖接壤的任何州或省的古新世或始新世报道过爬行动物。此外，这里报道的所有爬行动物都是白垩纪末期恐龙和大海爬行动物大规模灭绝的幸存者。乌龟的代表是现代Chelonia属的大型海龟和分配给cf的软壳海龟。 Trionyx，Trionychidae家族的现代属；小鳄鱼也代表。以前，据说克莱顿动物区系代表近岸咸味至近乎海洋的环境。在克莱顿爬行动物的基础上，人们可以通过建议在亚热带或热带气候下的河流，沿海环境来进一步完善这一解释。

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