DISCOVERY AND GEOLOGICAL SIGNIFICANCE OF THE LATE PALEOZOIC SPORE FOSSILS IN NORTH QINLING, HENAN PROVINCE
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摘要: 河南南召地区的柿树园组为一套浅变质碎屑岩系，在其中、下部灰岩夹层中采获较丰富的古孢子化石：Ｃａｌａｍｏｓｐｏｒａｃｆ．ｍｉｃｒｏｒｕｇｏｓａ，Ｄｉｃｔｙｏｔｒｉｌｅｔｅｓｍｉｎｏｒ，Ｐｕｎｃｔａｔｌｐｏｒｉｔｅｓｍｉｎｕｔｕｓ等属种，时代为晚古生代沉积。从柿树园组原宕建造性质、变质及变形作用特点分析，它不应划归二郎坪群（下古生界）或宽坪群（上元古代），其层位与豫陕交界地区的粉笔沟组和信阳群的南湾组大体相当。在晚古生代时期北秦岭为一海槽，从柿树园组被晚三叠世陆相含煤地层不整合覆盖，说明这一海槽于二叠纪末期闭合，形成了北秦岭华力西褶皱带。Abstract: The Shishuyuan Formation distributed in the Nanzhao area,Henan,is represented by alow-grade metarnorphic clastic sequence. The discovery of abundant Late Paleozoic fossils（e.g.Calamospora cf. microrugosa, Dictyotriletes minor, and Punctotiporites minutus ） in the limestoneinterbds in its lower and middle oarts has demonstrated that this formation should be Late Pa-leozoic in age. From its prctoliths and their deformation and metamorphism,it should not be as-signed to the Erlangping Group （ Lower Paleozoic ） or the Kuanping Group（upperProterozoic）.Stratigraphically it is largely equivalent to the Nanwan Forrnation cf;he XinyangGroup and the Fenbigou Formation on the Henan-Shanxi Border. in the Late Paleozoic,NorthQinling was a sea trough,overlain unconformably by Late Triassic continental coal measures.This indicates that this trough closed at the end of the Permian. Then the North QinlingVariscan fold belt was formed.
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