New Developement of Study on Lower Part of Cambrian in Cambrian Standard Profile in Zhangxia-Gushan Area in Shandong Province

Standard profiles in Cambrian distribute in Zhangxia and Gushan town in Changqing district of Jinan city.Cambrian strata developed very well in this area with good crop,and Palaeobio-fossils of trilobite were preserved well.This area is standard profile for carrying out studies,such as lithostratigraphy,biostratigraphy,chronostratigraphy and chemo-stratigraphy.According to micropaleontological conodont types and its distribution sequences in strata,6 condont biographic belts in upper part of Cambrian are set up.According to first occurrence of Cordylodus lindstromi,boundary of Cambrian and Ordovician is determined correctly.Characteristics of carbon-oxygen isotopic curve of Changhsingian in Cambrian is analyzed in this paper.Carbon isotopic curves in lower part of Changshangian and its in lower part of Furong series of Cambrian in Kazakhstan are contrasted,and contrast relationship between Cambrian in Huabei area and Cambrian abroad is set up.