淮北地区寒武系/新元古界界线讨论

淮北地区寒武系与新元古界的界线 ,长期以来存在争议 ,主要有 5种划分意见 :猴家山组 /沟后组 ,沟后组 /金山寨组 ,沟后组上段 /沟后组下段 ,金山寨组 /望山组及猴家山组 /金山寨组之间。通过近年来的实地考察和室内研究 ,从叠层石、宏体碳质压膜化石及小壳动物化石组合综合考虑 ,认为该区新元古界最上面的岩组应是沟后组 ,而超覆于区内新元古界不同层位上的长期被描述为猴家山组“豹斑状”灰岩、白云岩 ,实为昌平组 ,属下寒武统

COMMENTS ON THE CAMBRIAN/NEOPROTEROZOIC BOUNDARY IN HUAIBEI DISTRICT, NORTHERN ANHUI-JIANGSU

Lower Cambrian and Neoproterozoic strata are well developed in Huaibei, northern Anhui Jiangsu, eastern China. However, researchers pay little attention to investigate the Cambrian/Neoprotero zoic boundary, several different proposals for that boundary in the past literatures exist some unsolved problems. On the basis of detailed lithologic study with well preserved Cambrian small shelly fossils and Neoproterozoic carbonaceous remains and stromatolite assemblages, it is suggested here that the Cambrian/Neoproterozoic boundary could be placed at the interface between the Changping and Gouhou Formations. In addition, we correct the so called Lower Cambrian “Houjiashan Formation” to be “Changping Formation” in the working area because the lithology and fossils of that Lower Cambrian unit are much similar to the Changping Formation that is widely distributed in the adjacent North China Platform.