河南西峡盆地恐龙蛋化石及略论恐龙绝灭问题

The dinosaur egg fossils from the Xixia Basin,Henan with discussions on dinosaur extinction

关键词:  恐龙蛋  含蛋地层  恐龙绝灭原因  西峡盆地

Key words:  dinosaur egg  egg-containing horizon  reason for dinosaur extinction  Xi-xia Basin

摘要:

西峡盆地晚白垩世红色陆相碎屑岩系地层中(包括高沟组、马家村组、寺沟组),产有类型多、数量大、成窝性好的恐龙蛋化石。已发现有7科8属10种。自下而上,恐龙蛋的种类、数量、含蛋层数、蛋窝均大幅度地减少,由高沟组内5科67种,约10层含蛋层,至寺沟组内仅存1科1属2种,含蛋层为2层。恐龙绝灭原因的研究,已有30种以上的学说或观点,但这些观点都不能圆满地解释恐龙的绝灭问题。恐龙的绝灭应该是多因素的,既有地外的灾变,又有地内,生物本身生理的因素。在内、外因等诸因素的共同作用下,恐龙才有可能绝灭。

Abstract:

The dinosaur egg fossils are conspicuous by their significant quantities,varied types and nest preservation in the Late Cretaceous red continental clastic rock series including the Gaogou Formation,Majiacun Formation and Sigou Formation in the Xi xia Basin, Henan.They are involved in seven families,eight genera and ten species,and substan-tially decrease,from bottom to top,in types,quantities,egg-containing horizon and nest, i.e.about five families,six genera,seven species and ten layers of egg-containing hori-zons in the Gaogou Formation,and only one family,one genus,two species and two lay-ers of egg-containing horizons in the Sigou Formation.There is still considerable debate concerning the issues of dinosaur extinction.The authors contend that the reason for di-nosaur extinction is related not only to the extraterrestrial but also to the intraterrestrial catastrophic events as well as to dinosaurs themselves.