长期以来,多数中外地质工作者认为西准噶尔西南地区(相当西北地区地层区划西准噶尔分区的玛依勒山小区,下同)缺失下泥盆统,但也有人对此认识有所怀疑。关于达拉布特超基性岩带围岩地层时代的归属问题,迄今意见不一。我们近两年在该区野外工作中于玛依勒山及达拉布特超基性岩带围岩地层中采得腕足、珊瑚化石,经本所张研和曹宣铎同志鉴定,认为腕足类组合面貌与中国北部早泥盆世晚期近 For a long time, most Chinese and foreign geologists think that there is a lack of Lower Devonian in the southwestern area of ​​West Jogar (equivalent to the Ma’erle mountain area in the west-east part of the West Junggar sub-region of the northwest China), but some people have doubts about this. Opinion has so far been mixed on the ownership of the age of the surrounding rock in the Dalbott ultramafic rock belt. In the past two years we worked in the field work in the area to collect brachiopods and coral fossils in the Surgenic rocks in the Maiyilishan and Dalbott ultramafic rocks, which were identified by Zhang Yan and Cao Xuan Duo, Facing the late Early Devonian in northern China