大别造山带北缘西部中生代晚期火山、沉积地层的时代

大别造山带北缘西部的一套火山岩及其上的"红层",依据叶肢介、同位素年龄值和较丰富的恐龙蛋和少量介形虫化石,从下而上划分为陈棚组、周家湾组,时代归属早、晚白垩世.陈棚组角度不整合于上侏罗统朱集组或段集组之上,向东与安徽省境内的早白垩世毛坦厂组、白大畈组为相同层位.周家湾组角度不整合于陈棚组之上,含较丰富的恐龙蛋化石,始-古新世李庄群不整合覆于其上.

The Classification of Lava and Sedimentary Strata of Late Mesozoic in the West Part of Northern Dabie Orogenic Belt

A series of the lava and the red strata up them in the west part of northern Dabie orogen were divided into Chenpeng Formation and Zhou Jiawang Formation, which belong to the early and late Cretaceous period, according to the conchostracans, the isotope age and the fossils of abundant dinosaur eggs and a few ostracodas. Chenpeng Formation lies on the Zhuji Formation or Duanji Formation in late Jurassic through angle unconformity Contact and it was the same strata with the Mao Tanchang Formation and Bai Dafan Formation in early Cretaceous in Anhui Province towards east. Zhou Jiawang Formation distributed on Chenpeng Formation through angle unconformity, which contained with abundant dinosaur egg fossils. Lizhuang group covered on them through unconformity in early Paleocene period.