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一、引言 那丹哈达岭位于黑龙江省的东部,是完达山脉的北东延伸部分,西界为宝清县大和镇,东邻苏联。这里分布着巨厚的海相沉积地层。1959年中、苏科学院黑龙江流域综合考察队乌苏里江地质队奥尔干诺夫、戈沃罗夫、王秀璋等把这套地层命名为二道河子岩群,三分为镇江岩系、向阳岩系及挠力河岩系。他们根据若干延续时代很长的放射虫残骸Nassellaria类(纲网虫类)、Spumellaria类(泡球虫类)和Charophyta(藻)及在邻区(即所谓宝清过渡带北)采到动物化石Monotis ocholica,
I. Introduction Nadan Hada Ridge is located in the east of Heilongjiang Province and is an extension of the northeast of the Wanda Mountains. It borders on Daihe Town in Baoqing County to the east and the Soviet Union to the east. There is a huge distribution of marine sediments. In 1959, the comprehensive investigation team of the Heilongjiang River basin of the Soviet Academy of Sciences Wusuli River geological team Organov, Govorov, Wang Xiuzhang such as the formation named Erdaohezi rock group, divided into three Zhenjiang rock series, sunny Rock series and Naoli river system. Based on the Nassellaria, Spumellaria and Charophyta species of the long-lived radioactive worm wreckage and their fossil monotis in the neighboring region known as the Baoqing Transitional Belt, ocholica,