The Bashkirian is in the International Commission on Stratigraphy geologic timescale the lowest stage or oldest age of the Pennsylvanian.
The Bashkirian age lasted from 323.4 to 315.2 Ma,[3] is preceded by the Serpukhovian and is followed by the Moscovian.
The stage was introduced by Russian stratigrapher Sofia Semikhatova in 1934.
The base of the Bashkirian is at the first appearance of conodont species Declinognathodus noduliferus.
[6] The GSSP (type location for the base of a stage) for the Bashkirian is in the Battleship Wash Formation at Arrow Canyon, Nevada.