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An additional example of the ichnogenus Zoophycos in Cambrian strata (Gallatin Formation; Wyoming, USA)
Palaeoworld ( IF 1.7 ) Pub Date : 2020-06-21 , DOI: 10.1016/j.palwor.2020.06.009
James R. Thomka

The ichnogenus Zoophycos is relatively rare in Cambrian-age sedimentary rocks, being far more commonly encountered in post-Devonian, and particularly post-Paleozoic, strata. A new occurrence of Zoophycos from the Upper Cambrian Gallatin Formation of the Bighorn Mountains, north-central Wyoming, USA, is reported herein. Material consists of a single specimen preserved within quartz silt representing the upper surface of a graded quartz arenite bed. The burrow is a relatively wide, curved, horizontally oriented lobe with a poorly visible marginal tube but well-developed internal lamellae. Discovery of this specimen contributes to the paleobiogeographic distribution of lower Paleozoic Zoophycos, adds to the literature suggesting that most Cambrian Zoophycos were horizontal and shallow-tier structures, and provides further support to the notion that relatively complex deposit-feeding behavior evolved earlier in the Phanerozoic than had long been recognized.



中文翻译:

寒武纪地层中ichnogenus Zoophycos的另一个例子(Gallatin 组;怀俄明州,美国)

该遗迹属Zoophycos是寒武纪时代的沉积岩比较少见的,在后泥盆纪被更经常遇到,特别是后古生代地层。本文报道了美国怀俄明州中北部比格霍恩山脉上寒武统加勒廷组新出现的动物藻。材料由保存在石英粉砂中的单个样品组成,代表分级石英砂岩床的上表面。洞穴是一个相对较宽、弯曲、水平方向的裂片,边缘管不明显,但内部薄片发育良好。这个标本的发现有助于下古生代动物藻的古生物地理分布,增加了文献表明大多数寒武纪Zoophycos是水平和浅层结构,并进一步支持了这样一种观点,即在显生宙早期演化出的相对复杂的沉积物摄食行为比人们早已认识到的要早。

更新日期:2020-06-21
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