浙东沿海震旦系的发现

DISCOVERY OF THE SINIAN SYSTEM IN THE COASTAL AREAS OF EASTERN ZHEJIANG

浙东沿海中生代火山岩系十分发育 ,分布极广 ,在大片火山岩系覆盖的永嘉市枫林镇附近出露一套浅变质沉积地层 ,由于缺乏生物化石依据 ,其地层时代长期被定为上侏罗统诸几组 a段 (J3za)或茶湾组 (J3c) ,抑或下白垩统馆头组 (K1 g)等。“九·五”期间 ,笔者在这套浅变质地层中首次发现了极其丰富的微古植物化石。微古植物化石中的大多数属种见于我国浙西、赣东北、皖南、鲁东北等地区震旦纪地层中和俄罗斯陆台与西伯利亚陆台上里菲及文德系中。据此 。

Abundant micropaleophytes have been first found in a suit of slightly metamorphic sedimentary strata near Fenglin Town of Yongjia City, extensively covered by the Mesozoic volcanic rock in the coastal areas of eastern Zhejiang. The ages were ascertained as the Upper Jurassic Chawan Formation (J 3 c ) or Lower Cretaceous Guantou Formation(K 1 g ). Based on micropaleophytes, the authors consider the fossil bearing stratum to be Sinian, providing a reliable basis for studying basal structure in the coastal areas of eastern Zhejiang and even southeastern China.