【摘要】 系统地描述了产于黑龙江省东部龙爪沟群七虎林组的一些双壳类化石 ,共计 6属 8种 ,结合所研究标本对Leionucula与Palaeonucula、Malletia与Mesosaccella等属之间的区别及Entoliumorbiculare的定向等问题进行了探讨 ,并对七虎林组的时代进行了讨论。更多还原

【Abstract】 This paper systematically describes some bivalve fossils, belonging to 6 genera and 8 species, from the Qihulin Formation of the Longzhaogou Group in eastern Heilongjiang Province. Meanwhile, distinctions between the genera Lionucula and Palaeonucula, Malletia and Mesosaccela , as well as the differentiation of valves for Entolium orbiculare are discussed based on the studied fossils. In addition, the age of the Qihulin Formation is also discussed briefly.更多还原