OSTRACODA FROM THE QINGYUANGANG FORMATION IN THE SOUTHERN HAILAER BASIN, Nei MONGOL
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Abstract:
Abundant Ostracods have been found from the red clastic rocks of the Qingyuangang Formation, the wells of Beier Depression and Wuerxun Depression, southern Hailaer Basin in Inner Mongolia Autonomous Region. Based on the composition and distribution of these Ostracoda species, two Ostracoda assemblages have been classified: Altanicypris obesa-Talicypridea turgida assemblage (lower member) and Chinocypridea augusta-Talicypridea qingyuangangensis assemblage (upper member). These fossils mainly consist of Altanicypris,Talicypridea, Chinocypridea with cristid and Harbinia with reticulation, and are characterized by the strong endemic color, representing the late stage of Late Cretaceous fossil ostracoda fauna in Northeast China. These Ostracoda assemblages may be correlated with that of the Sifangtai Formation of Songliao Basin, indicating their Maastrichtian age, Late Cretaceous.
