塔里木盆地中、晚奥陶世疑源类组合

Middle-Late Ordovician Acritarch Assemblages from the Tarim Basin, Xinjiang

塔里木盆地中、晚奥陶世疑源类被划分为４个组合，自下而上分别为Ｐｅｔｅｉｎｏｓｐｈａｅｒｉｄｉｕｍ－Ｂａｌｔｉｓｐｈａｅｒｉｄｉｕｍ组合，Ｂａｌｔｉｓｐｈａｅｒｏｓｕｍ－Ｄｉｃｈｏｔｉｓｐｈａｅｒａ组合，Ｎａｖｉｆｕｓａ－Ｏｒｄｏｖｉｃｉｄｉｕｍ组合及Ｄａｃｔｙｌｏｆｕｓａ－Ｌｅｉｏｓｐｈａｅｒｉｄｉａ组合。下部３个组合产于中奥陶统，代表台地—台缘斜坡相环境，最上部１个组合产于上奥陶统。

Four acritarch assemblages, namely in ascending order, Peteinosphaeridium Baltisphaeridium, Baltisphaerosum Dichotisphaera, Navifusa Ordoricidium, Dactylofusa Leiosphaeridia assemblages, covering the age from Middle to Late Ordovician have been first documented from the Tarim Basin. The three assemblages from the lower part are Middle Ordovician in age and represent platform to slope facies environment while the assemblage from the upper part is Late Ordovician in age and represents littoral facies or terrestrial facies enviroment.