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The oldest hyolithids (Cambrian Series 2, Montezuman Stage) from the Iapetan margin of Laurentia
Journal of Paleontology ( IF 1.3 ) Pub Date : 2020-04-02 , DOI: 10.1017/jpa.2020.8
John S. Peel , Sebastian Willman , Steven J. Hageman

The recent description of the nevadioid trilobiteBuenellus chilhoweensisWebster and Hageman, 2018 established the presence of early Cambrian Montezuman Stage (Cambrian Series 2, Stage 3) faunas in the Murray Shale of Chilhowee Mountain, Tennessee. The description recognized the oldest known age-diagnostic Cambrian trilobite from the Laurentian margin of the former Iapetus Ocean sinceBuenellusBlaker, 1988 is known otherwise only from the Sirius Passet Lagerstätte on the Innuitian margin of North Greenland. The bivalved arthropodsIsoxys chilhoweanusWalcott, 1890 andIndota tennesseensis(Resser, 1938a) have also been described from the Murray Shale, but hyolithids appear to be the dominant body fossils in terms of diversity and abundance. Although poorly preserved, the hyolithids occurring together withBuenellus chilhoweensisare described to improve understanding of the Murray Shale biota. The hyolith assemblages of the Murray Shale and Sirius Passet Lagerstätte are not closely similar, although the poor preservation of both hinders comparison.

中文翻译:

劳伦蒂亚伊阿佩坦边缘最古老的水石类(寒武纪系列 2,蒙特祖曼阶段)

最近对内华达三叶虫的描述智利白线虫Webster 和 Hageman,2018 年在田纳西州奇尔豪威山的默里页岩中确定了早期寒武纪蒙特祖曼阶段(寒武纪系列 2,阶段 3)动物群的存在。该描述确认了自前土卫三海洋劳伦斯边缘以来已知最古老的年龄诊断寒武纪三叶虫布内利斯Blaker, 1988 仅在北格陵兰因纽蒂安边缘的 Sirius Passet Lagerstätte 为人所知。双壳节肢动物辣椒沃尔科特,1890 年和田纳西印度洋槐(Resser, 1938a) 也曾在默里页岩中被描述过,但就多样性和丰度而言,水石类似乎是主要的身体化石。虽然保存得很差,但与水石一起发生的智利白线虫被描述为提高对默里页岩生物群的理解。Murray 页岩和 Sirius Passet Lagerstätte 的冰晶石组合并不十分相似,尽管两者保存不善阻碍了比较。
更新日期:2020-04-02
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