湖北郧县青龙山一带晚白垩世地层及恐龙蛋化石初步研究

THE LATE CRETACEOUS STRATUM AND DINOSAUR EGGS IN QINGLONGSHAN REGION, YUNXIAN COUNTY, HUBEI PROVINCE

郧县青龙山一带的上白垩统是一套以冲积扇相为主体的红色陆源碎屑沉积，依据岩性变化，可分为上、中、下３个组合．下部组合含多个产恐龙蛋化石的层位．上部组合与毗邻的李官桥盆地胡岗组（Ｋ３２ｈｇ）可以对比．红寨子、青龙山一带的恐龙蛋化石分布集中，藏量丰富，类型较多，埋藏甚浅，保存好，实属举世罕见．据初步研究，蛋壳的显微结构有５种类型，分属于５个恐龙蛋科，即Ｄｅｎｄｒｏｏｌｉｔｈｉｄａｅ，Ｄｉｃｔｙｏｏｌｉｔｈｉｄａｅ，Ｆａｖｅｏｌｏｏｌｉｔｈｉｄａｅ，Ｐｒｉｓｍａｔｏｏｌｉｔｈｉｄａｅ和Ｓｐｈｅｒｏｏｌｉｔｈｉｄａｅ，其中以Ｄｅｎｄｒｏｏｌｉｔｈｉｄａｅ分布最广、数量最多．

The Upper Cretaceous redbeds of Qinglongshan region, Yunxian County,is a set of continental clastic sediments dominated by alluvial fan facies. They may be divided into three rock assemblages. There are a number of beds of fossil dinosaur eggs in the lower rock assemblage, and the upper rock assemblage could be compared with the Hugang Formation (k 3 2 hg ) of the Late Cretaceous in Liguanqiao basin. The fossil dinosaur eggs of the Hongzhaizi-Qinglongshan region, rarely seen in the world show the following characteristics: concentrated distribution, rich in storage, a large varieties, shallow burial, and complete primary state. There are five kinds of microstructures of the dinosaur eggshell in the Hongzhaizi-Qinglongshan region, belonging to five families respectively, Dendroolithidae, Dictyoolithidae, Faveoloolithidae, Prismatoolithidae and Spheroolithidae. Among them, Dendroolithidae is the greatest in quantity, and widely dispersed over Qinglongshan region.