在云他山脉(uiuta MtS)南坡的红松组(Red-Pine Formation)灰色、灰绿色粉砂岩和页岩中,发现了属于Chuaria Circularis walcott,1899的毫米大小的圆盘状压缩碳质体。这些化石被认为是压平的浮游生物遗迹,成为犹他州东北部第一批肉眼可见的良好的前寒武纪化石。化石的产出与先前解释的红松页岩(Red Pine shale)部分是在海相环境中沉积是一致的,故可以将云他山群(unita Mt.group)上部地层与北美及其他地区的晚前寒武纪地层进行普遍的对比。 In the gray, greenish-gray siltstone and shale of the Red-Pine Formation on the southern slope of the uiuta MtS, millimeter-sized discotic compressed carbonaceous bodies belonging to Chuaria Circularis walcott, 1899 were found . These fossils are considered flattened plankton relics and became the first macular visible, good Precambrian fossils in northeastern Utah. The fossil output is consistent with the previously explained part of the Red Pine shale in a marine environment so that the Upper Unita Mt.group strata can be co-located with North American and other Late Precambrian strata underwent a general comparison.