LATE CRETACEOUS CONCHOSTRACAN FOSSILS DISCOVERED IN NENJIANG FORMATION, SOUTHWEST UPLIFT OF SONGLIAO BASIN

A total of 6 species of 4 genera conchostracan fossils have been first discovered in Gaoliban Town, southwest uplift of Songliao Basin, including Estherites (Euestherites) cf. pulcherrimus Zhang et Chen, Estherites (Euestherites) sp., Estherites sp., Halysestheria biformis Zhang et Chen, Glyptostracus sp. and Dictyestheria sp., indicating the Late Cretaceous Nenjiang Formation in age. The discovery lays a foundation for the establishment of stratigraphic sequence in the southwest uplift of Songliao Basin and provides a strong support for further oil-gas geological survey and research in the area.