The reasons for and results of a revision of coarse-ribbed choristitids (predominantly those of Bashkirian age) are presented. The Bashkirian choristitids are considered as members of two subgenera of the genus Alphachoristites ...

Tengiz field is an isolated carbonate buildup in the southeastern Precaspian Basin, containing a succession of shallow-water platforms ranging in age from late Famennian to early Bashkirian. Platform backstepping from ...

he Tengiz buildup, an intensely cored and studied isolated carbonate platform in the Precaspian Basin, contains a succession of shallow-water deposits ranging from Famennian to Bashkirian in age. From a reservoir perspective, ...