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丘尔群(Chuar)出露于科罗拉多河的支流峡谷中,范围是长24公里,宽6公里。在东部,丘尔群与古生代地层成断层(孤山断层)接触;在西部,古生代地层不整合覆于丘尔群之上。丘尔群厚2013米,分成三个组和七个段。下部二个组,即加勒洛斯组(Galeros)和克瓦贡特组(Kwagunt),主要是泥质岩,带有少量薄的石灰岩层;上部为六十英里组,主要是角砾岩。有三个存在迭层石的岩层,其中一层是生物岩礁,迭层石的形态属主要是:Inzeria,Baicalia,和Boxonia,表明是晚里菲的沉积。在克瓦贡特组的顶部,发现了大的浮游生物化石Chnaria,丘尔群可能比亚利桑那州的其它前寒武纪地层要晚,它与加利福尼亚东部的寒武系下部地层是同时代的,与科迪勒拉北部的文德米尔(Windermere)组可以对比。
Chuar is revealed in the tributary valley of the Colorado River, which is 24 km long and 6 km wide. In the east, the Chur Group contacts the Paleozoic strata (the Gushan fault); in the west, the Paleozoic unconformities overlie the Chur Group. Chul Group thick 2013 meters, divided into three groups and seven sections. The lower two groups, Galeros and Kwagunt, are predominantly argillaceous with a few thin limestone formations; the upper sixty-mile group is dominated by breccia. There are three rock layers with laminated rocks, one of which is a bio-rock reef. The main genera of the layers are Inzeria, Baicalia, and Boxonia, indicating late-Philippine sediments. At the top of the Kvogunter Formation, a large planktonic fossil, Chnaria, is found that is likely to be later than other Precambrian formations in Arizona, contemporaneous with Lower Cambrian strata in eastern California, The Windermere group in northern Derela can be compared.