通过对准噶尔盆地南缘重点探井的跟踪研究，于多口探井中相继发现了晚白垩世介形类动物化石，这些化石点在面上的不断增多，为研究盆地南缘上白垩统分布提供了相当重要的古生物化石依据。现有资料表明，准噶尔盆地南缘晚白垩世沉积不限于东沟组一套沉积物，还表明南安集海河以西无疑存在上白垩统 Through the follow-up study of key exploratory wells in the southern margin of Junggar Basin, late Cretaceous ostracods have been found in many exploration wells. These fossils are continuously increasing in surface area, which provides a basis for studying the Upper Cretaceous distribution in the southern margin of the basin Quite important paleontology fossils basis. The available data show that the Late Cretaceous sediments in the southern margin of the Junggar Basin are not limited to a sediment in the Donggou Formation but also indicate the existence of the Upper Cretaceous to the west of the Jiji River in Nan’an