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二连盆地曾被认为是缺失三叠纪沉积的地区。通过阿拉坦合力凹陷坦参１井的孢粉化石分析，首次证实了在二连盆地存在早三叠世地层。坦参１井的下三叠统的视厚度１ ３３９ｍ （井深５５８～１ ８９７ｍ ），以紫红色、棕红色的泥岩为主，夹灰绿色泥岩，向下岩性变粗，含砾泥岩、砂砾岩增加，与上覆侏罗系及下伏上二叠统皆呈不整合接触。井深７００～１ ８９６ｍ 产以Ｌｉｍ ａｔｕｌａｓｐｏｒｉｔｅｓ大量出现、Ｔａｅｎｉａｅｓｐｏｒｉｔｅｓ具一定含量、出现Ｌｕｎｄｂｌａｄｉｓｐｏｒａ、Ａｒａｔｒｉｓｐｏｒｉｔｅｓ和Ｌｕｅｃｋｉｓｐｏｒｉｔｅｓ为主要特征的早三叠世孢粉化石组合。这一发现对重新认识二连盆地的地质发育历史颇有意义
The Erlian Basin was once considered to be a region lacking Triassic sediments. The sporopollen fossil analysis of the well Tanshen-1 well in the Alathan cohesion for the first time confirmed the existence of the Early Triassic strata in the Erlian Basin. The apparent thickness of the Lower Triassic in Well Tanshen-1 is 1 339m (558 ~ 1897m) with purple-red and reddish-brown mudstone with gray-green mudstone, thickening downward, gravel mudstone, gravel The rocks increased with unconformity with the overlying Jurassic and underlying Upper Permian. The deep-seated 700 ~ 1896 m production occurs mainly in the Lim atula sporites, and the Taeniaesporites have a certain amount of sporopollen assemblages characterized by Lundbladispora, Aratrisporites and Lueckisporites. This finding is of great significance to re-understand the geological development history of Erlian Basin