摘要
黑龙江省东部鸡西群为中生代海陆交互相含煤地层。根据岩性、岩相、沉积旋回、含煤性及古生物组合特征，将鸡西群原三分改为四分，即自下而上划分为滴道组、东荣组、城子河组和穆棱组。依据东荣组生物群面貌，特别是含菊石及Ｂｕｃｈｉａ带演化系列，将其时代定为启莫利一早伏尔加期，从城子河组中划出并与龙爪沟群上云山组对比。
Jixi group is paralic coal bearing formation of mesozoic according to the lithological characters,facies,depositional cyeles,coal bearing characters and palaeontologic assemblages,this paper divided the Jixi Group into four Formations (in ascerting orders):Didou Fm,Dong rong Fm,Chengzihe Fm and Muling Fm instead the formerly division.Dong-rong Fm established according to the fossil assemblages especially the Ammonites and Buchia zone evolutionary series,which was part of Chengzihe Fm formerly and placed this formation to Kimmeridgian early Volgian in age,which can be correlated with Shangyunshan Fm of Longzhaogou Group.
