描述黑龙江省东部上云山组和大架山组腹足类化石4属(Mathilida，Uchauxia，Nododelphinula，Trochactaeon)7种，其中2新种：Uchauxia yunshanensis sp．nov．，Nododelphinula dajiashanensis sp．nov．。它们均是特提斯海区早白垩世腹足动物群中常见分子，根据这些腹足类化石的分布和对比，其地层时代应为早白垩世阿普第期一阿尔必期。文内阐述上云山组沉积环境——近高潮附近的泥滩或泥湾，而大架山组沉积环境——低潮线附近浅水。

The age of the Upper Yunshan Formation of the Longzhaogou Group, Yunshan area of easthern Heilongjiang Province, was considered to be Upper Jurassic by earlier authors ( Li and Yuan ,1991; Li, 1996; Yu and Zhu,1983). Recently some scientists from Nanjing Institute of Geology and Palaeontology, the Chinese Academy of Science have done much field-work there and got some gastropod specimens from the upper part of the Dajiashan Formation in the Dajiashan area of easthern Heilongjiang Province. The gastropod fossils described in this paper were collected from the Yunshan Formation and Dajiashan areas of easthern Heilongjiang. The fauna consists of 7 species in 4 genera. The specimens from the Yunshan Formation described in this paper are picked out from an old collection of Nanjing Institute of Geology and Paleontology, the Chinese Academy of Science,Nanjing.

Q915.817.2

中国科学院知识创新工程重要方向项目 (KZCX2 114 )，国家自然科学基金 (No .40 0 72 0 0 4)资助课题