一、上前寒武系沉积岩的生物地层对比在巴西上前寒武系地层中,找到了越来越多的化石。在巴西的前寒武系地层中,目前已知有迭层石产地达15处以上,而微化石及可能的微化石的产地也有十余处,还有无烟煤和可疑化石。从1971年在巴西米纳斯吉拉斯州的帮布威群(Bambaui)中首次发现清楚的迭层石(Conophyton)以来,就采用现代技术来研究迭层石的生物地层。从那以后,在巴西的东南部帮布威群及与其相当的网申吉(Acungui)群及米纳斯吉拉斯州的古老 First, the pre-Cambrian sedimentary rock biostratigraphy contrast Precambrian strata in Brazil, to find more and more fossils. Of the Precambrian strata in Brazil, there are currently over 15 deposits of laminated stone, and there are more than a dozen of microfossils and possibly fossil fuels, as well as anthracite and doubtful fossils. Since the first clear-cut Conophyton in Bambaui, Minas Gerais, Brazil, in 1971, modern techniques have been used to study the biostratigraphy of laminated rocks. Since then, there has been a series of events in the Upper-Middle-Upper Bangui group in Brazil and its equivalent Acungui cluster and the ancient Minas Gerais state