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对首次发现于黑龙江虎林县东北部Ｈ８７３孔龙爪沟群的海相沟鞭藻类进行了初步研究，沟鞭藻组合包括１２属２０余种，其中描述和照相９属１７种，包含４新种：Ａｒｅｏｓｐｈａｅｒｉｄｉｕｍａｓｔｅｒｉｐｈｏｒｕｍｓｐ．ｎｏｖ．，Ｃａｎｎｉｎｇｉａｈｕｌｉｎｅｎｓｉｓｓｐ．ｎｏｖ．，Ｃｉｒｃｕｌｏｄｉｎｉｕｍｃｉｎｇｕｌａｔｕｍｓｐ．ｎｏｖ．和Ｌｅｐｔｏｄｉｎｉｕｍｈｕｌｉｎｅｎｓｅｓｐ．ｎｏｖ．。根据全球分布的一些重要种的地质历程，认为以Ｏｌｉｇｏｓｐｈａｅｒｉｄｉｕｍ属占优势和以丰富或较丰富的Ｏｄｏｎｔｏｃｈｉｔｉｎａｏｐｅｒｃｕｌａｔａ，Ｇａｒｄｏｄｉｎｉｕｍｔｒａｂｅｃｕｌｏｓｕｍ，Ｃｉｒｃｕｌｏｄｉｎｉｕｍａｔｔａｄａｌｉｃｕｍ，Ｐａｌａｅｏｐｅｒｉｄｉｎｉｕｍｃｒｅｔａｃｅｕｍ为代表的沟鞭藻组合的地质时代应为Ｈａｕｔｅｒｉｖｉａｎ－Ｂａｒｅｍｉａｎ期，很可能为Ｈａｕｔｅｒｉｖｉａｎ晚期－Ｂａｒｒｅｍｉａｎ期。在地层上可能相当于龙爪沟群的七虎林组上部。据此推论，龙爪沟群的地质时代很可能为早白垩世。
A preliminary study on the marine dinoflagellates found in the H873 Konglongsagou Group in the northeast of Hulin County, Heilongjiang Province was carried out. The dinoflagellates assemblage includes more than 20 species of 12 genera, of which 17 species are described and photographed in 9 genera, including 4 new species: Areosphaeridiumaster iphorumsp. nov Canningiahulinensissp. nov , Circulodiniumcingulatumsp. nov And Leptodini ühulinensesp. nov . According to the geological history of some important species in the world, the geological age of the dinoflagellates, which is dominated by Oligosphaeridium and represented by rich or abundant Odontochitina operculata, Gardodinium trabeculosum, Circulodiniumattadalicum and Palaeoperidiniumcretaceum, should be Hauterivian-Baremian Period, most likely for Hauterivian late-Barremian period. In the strata may be equivalent to the Dragon claw group of upper part of the Seven Humphreys. Based on this, it is probable that the geologic age of Longchugou Group is probably Early Cretaceous.