摘要:
一、前言早奥陶世时期的“华北地台”是一个十分广阔的碳酸盐台地,西至贺兰山以西,南至祁连山、秦岭、伏牛山、大别山,东至渤海和东海,北至阴山以北,包括陕、甘、宁、蒙、晋、冀、鲁、辽、吉、豫、皖、苏、京、津等十四个省、市、自治区的全部或部分地区,是我国最大的地台之一。本文涉及的范围乃华北地台东部的腹地,即西至黄河,东至海,南至陇海路,北至内蒙;乃晋、冀、鲁、京、津的全部或大部地区,也包括豫北、苏北、辽西部分地区。
Abstract:
The paper shows that obvious change takes place in north-south Ordovician depo- sits is North Chias Platform.Its south part rose during Yeli Age, and sea water wi- thdrew from north to south.The sediments of Yehli Formation is not Iound is a zone betweea Mouat Song and Yu Couaty but occurs is Fengfeng. Further towards north, they are well developed.Therefore, from Fengfeng to West Beijing forms a slope with its gradient of 1，5000, its south is high,north low.Dolomite facies dec- reases from south to north till vanish, whereas micrite increases from south to north. Organic fossil is from nothing to appearance and again from abundance to decrease from Mount Song to West Beijing
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