蒙古东南部早白垩世新水井组的甲壳类化石

蒙古人民共和国早白垩世介形类和叶肢介的研究已有半个多世纪的历史,文中介绍了一个新的化石产地———蒙古东南部新水井地区和若干属种,主要是介形类和叶肢介,并依据这些年来在中国境内的多处发现,进行了相应地层对比及沉积环境的讨论。

EARLY CRETACEOUS CRUSTACEA (OSTRACODA,CONCHOSTRACA) FROM THE SHINE-KHUDUK FORMATION OF SE MONGOLIA

SummaryIn Summer of 2000, an international research group consisted of Japanese, Mongolian, Chinese and American scientists and led by Dr. M.Matsukawa had carried out a field investigation on dinosaur tracks and strata concerned in SE Mongolia, N and NE China for about two months. Here described and illustrated are some crustacean fossils. They include 9 species in 2 genus of ostracodes, and two species of conchostracans (Yanjiestheria gobiensis Chen sp. nov., Neodiestheria mongolensis Chen sp. nov.). These ostracodes could be called the Cypridea-Lycopterocypris assemblage including C. (Cypridea) actuosa, C.(C.) cf. vitimensis, C. (C.) prognata, C. (Pseudocypridina)globra, C.(P.) ellipselloides, C. (Ulwellia) cf. orbiculatodes, Lycopterocypris cf. circulata, L. liaoxiensis, and L.? semirotunda. These forms appeared in several Cretaceous basins of N and NE China, and especially they are very similar to those from the Jiufotang Formation with the famous late Jehol biota in western Liaoning. The Yanjiestheria and Neodiestheria are two common genera of the Lower Cretaceous of China, SW Japan and southern Korean Penusula. Therefore the Shine-Khuduk Formatrion yielding above-mentioned fossil ostracodes and conchostracans of SE Mongolia should be Early Cretaceous in age.