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桃山笔石产地位于吉林省长春市南郊,属伊通县景家台及莫里青公社管辖。地层以前统称为呼兰群,地质时代的归属一直没有定论(表1)。1977年,吉林省地质局区调六分队于该地首次发现笔石,并经初步研究,定其时代为早志留世,始建桃山组。后经槽探揭露,发现53个笔石层位,采集标本达1,300余块,鉴定为18属50余种(不包括新种)。
Peach Hill pen stone is located in the southern suburbs of Changchun City, Jilin Province, Yitong County is Jingtai and Murray Green commune jurisdiction. Formerly known as the Hulan group strata, geologic era of ownership has been inconclusive (Table 1). In 1977, the Geological Bureau of Jilin Province transferred six points to find the pen stone in the area for the first time and, after a preliminary study, set its time as early as the Chihsien and built the Tao Mountain Group. After revealing by trenching, 53 petroglycan layers were found, collecting more than 1,300 specimens and identifying more than 50 species (excluding new species) of 18 genera.