河南恐龙蛋化石组合类型及其地层时代意义

根据恐龙蛋化石在河南省 10余个盆地中纵向上的分布特点 ,结合孢粉、轮藻、介形类、岩石同位素年龄及产蛋盆地的大地构造发展演化特征 ,研究认为其代表的地层时代为晚白垩世 ,并提出了 3种不同的蛋化石组合类型 ,进一步“三分”上白垩统 :即下部组合为长圆柱形蛋、蜂窝蛋、树枝蛋、网格蛋 ;中部组合为椭圆形蛋、副圆形蛋、树枝蛋 ;上部组合为长形蛋、巨形蛋 ,分别代表晚白垩世早、中、晚 3个时期

OOLITHIAS ASSEMBLAGES IN HENAN PROVINCE AND ITS AGE SIGNIFICANCES

The oolithias of dinosaurs,as special fossil eggs, take an important role in subdividing and contrasting of the continental strata in Mesozoic. It is found abundantly in more than ten basins among fifty Mesozoic Cenozoic sedimentary basins in the northern, southern and western of Henan Province. Based on the vertical occurrences characteristics of the oolithias of dinosaurs in the strata, and with the aids of charophytes, sporo pollen, ostracods, dinosaur skeletons, as well as isotopic ages and the tectonic evolution of these sedimentary basins, the authors conclude that the ages of the strata were Late Cretaceous, and that the oolithias assemblages such as (the lower group) Longiteroolithus Dendoolithus Faveoloolithus Dictroolithus, (the middle group) Spheroolithus Paraspheroolithus Dendroolithus, (the upper group) Elongatoolithus Macroolithus may be used respectively as the signs of the early ,middle and later periods of the Late Cretaceous.