The geology and paleontology of the late Cretaceous marine deposits of the Dakotas
The geology and paleontology of the late Cretaceous marine deposits of the Dakotas
复制标题
达科他州晚白垩世海洋沉积物的地质学和古生物学
DOI：
10.1130/spe427
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
D. Parris
中科院分区：
文献类型：
--
作者：
James E. Martin;D. Parris
自1804年刘易斯和克拉克在西部发现化石以来，密苏里河沿岸的白垩纪皮埃尔页岩群已经产生了大量的马萨龙标本，其中包括一条45英尺长的“鱼”。其中许多海洋爬行动物标本代表了最大的马赛龙--霸王龙。1990年，在南达科他州中部莱曼县尼古拉斯克里克附近发现了迄今为止密苏里河沿岸最大的镶嵌恐龙。该标本是从代表Pierre页岩群内部不整合的滞后沉积中发现的，由脊椎、肋骨、桨状元素和部分头骨组成。该部分骨骼可参照Tylosaounae亚科，参看。Tylosaurus sp.，体型大，牙齿结构，齿前喙较长。进一步的鉴定必须等待酪腐亚科的分类结果的解决。下巴长1.6米，表明投射的身体长度为11.5米。因此，刘易斯和克拉克描述的大型“鱼”可能是一种酪氨酸马赛龙。
The Cretaceous Pierre Shale Group along the Missouri River has produced numerous mosasaur specimens since the western fossil discoveries of Lewis and Clark in 1804 that included a 45-foot "fish." Many of these marine reptile specimens represent the largest of mosasaurs, the tylosaurines. In 1990 the largest mosasaur heretofore recorded along the Missouri River was discovered near Nicholas Creek, Lyman County, central South Dakota. The specimen was recovered from a lag deposit representing an intra—Pierre Shale Group unconformity and consists of vertebrae, ribs, paddle elements, and a partial skull. The partial skeleton is referable to the subfamily Tylosaurinae, cf. Tylosaurus sp., based on large size, tooth structure, and long predental rostrum. Further identification must await resolution of the taxonomy of the Tylosaurinae. A lower jaw measures 1.6 m, indicating a projected body length of 11.5 m. Therefore, the large "fish" described by Lewis and Clark may have been a tylosaurine mosasaur.