浙江长兴地区长兴组放射虫化石及其指相意义

浙江省长兴地区的长兴组煤山剖面一直作为中国乃至世界研究二叠系-三叠系界线的经典剖面之一。在该剖面,长兴组主要由灰黑、黑色碳酸盐组成,厚度约为30-45m。依据沉积岩性特征大致可划分上下2段:下段以灰黑或黑色的纹层状粒泥岩和泥粒岩为主,厚度约13m;上段由薄一中层状灰黑或黑色泥粒岩和粒泥岩组成,其中夹有极薄层的黑色钙质泥岩或泥岩和细条带状或透镜状硅质岩,厚27m左右。

RADIOLARIAN FOSSILS FROM THE CHANGXING FORMATION AT CHANGXING , ZHEJIANG PROVINCE AND THEIR FACIEOLOGICAL SIGNoncANCES

Theradiolarian fauna dealt with in the paper was collected from the upper part of the Changdng fomation of Zhejiang Provinoe. This faunacoznprisa 9 spedes beloagbg to 9 genem of Spunnellaria and AlbdUe.ada of radiolarian, TNs pap. ..y .x. . U.ng eo.o.t of . Oan.g n&oladan formadon and it is concluded that the upper partoftheChangxing formation is of pelagic fades. This conclusion comes from the following points: 1.TheupperpartoftheChangxingformation was developed in a kind of sea-basin sedimentation by the tudy in the tudy on the characteristics of the radiolan. fauna of this fomadon. 2The water depth in later Changxing period should be at least deeper than .200m in order to satisfy the sasfhy the paanktonic living habit of this radiolanan fauna of the formation, which is certified by the study on the distribution of modem radiolarian in oceans. 3 . The radiolarian fauna of Changxing formation is thought to live in a pelagic or hemipelagic enviromnent by compasring them witiolan of Palaeozoic in a worldwide scope