江汉盆地古新世的介形类

该文首次报道了江汉盆地可能属于古新世的非海相地层及其中的介形类化石,计有17属30种(其中新种3个),隶属于3个超科。该介形类动物群自下而上可分为:1.Porpocypris(?)-Paraily-ocypris-Cypridea组合;2.Sinocypris-Eucypris-Limnocythere组合。第2组合完全可与广东南雄盆地罗佛寨组的介形类化石群对比,时代可能为古新世晚期;第1组合的介形类是否可与广东南雄盆地上湖组的化石对比的问题,还有待今后发现更为可靠的Porpocypris属的代表分子来解决,这里暂置于古新世早、中期。

PALEOCENE NONMARINE OSTRACODA FROM THE YANGTZE-HAN RIVER BASIN, HUBEI

The present paper reports for the first time the occurrence of Paleocene nonmarine os-tracodes from the Yangtze--Han River Basin, including 30 species assigned to 17 genera and 3 superfamilies, They may be divided into 2 assemblages, the Porpocypris(?)-Parailyocypris-Cypridea Assemblage of Early-Middle Paleocene and the Sinocypris-Eucypris-LimnocythereAssemblage of Late Paleocene. The Lingnan Formation of the Dangyang area. the Dongshanand Zhaizheshan Formations of the Qingmen area, and the Upper Shashi Formation of sub-surface which contains the Sinocypris-Eucypris-Limnocythere Assemblage, can be correlatedwith the Luofuzhai Formation of the Nanxiong Basin, Guangdong. The Lingbei Formationof the Dangyang area, the Shigaoshan and Yaozheshan Formations of the Qingmen area andthe Lower Shashi Formation of subsurface which contain the Porpocypris(?)-Parailyocypris-Cypridea Assemblage are possibly correlated with the Shanghu Formation of the NanxiongBasin, Guangdong,but we have not found that it is the index ostracod fossil for the Early-Middle Paleocene Shanghu Formation of the Nanxiong Basin. providing sufficient evidence.