A definition for the top of the Bashkirian Stage is currently being evaluated.
The Moscovian Stage overlies the Bashkirian Stage and underlies the Kasimovian Stage of the Pennsylvanian Subsystem.
The top of the Serpukhovian is overlain by the Bashkirian Stage of the Pennsylvanian Subsystem and corresponds to the internationally accepted boundary drawn at the appearance of the conodont Declinognathodus noduliferus.
Bashkirian Stage, first of four internationally defined stages of the Pennsylvanian Subsystem of the Carboniferous System, encompassing all rocks deposited during the Bashkirian Age (323.2 million to 315.2 million years ago).
The base of the Bashkirian Stage is defined to correspond to the internationally accepted Mississippian-Pennsylvanian boundary, drawn at the appearance of the conodont (a primitive chordate with tooth-shaped fossil remains) Declinognathodus noduliferus.
The Mississippian Subsystem is made up of the Tournaisian (deposited 358.9 to 346.7 million years ago), Viséan (346.7 to 330.9 million years ago), and Serpukhovian (330.9 to 323.2 million years ago) stages, whereas the Bashkirian (323.2 to 315.2 million years ago), Moscovian (315.2 to 307 million years ago), Kasimovian (307 to 303.7 million years ago), and Gzhelian (303.7 to 298.9 million years ago) stages make up the Pennsylvanian Subsystem.
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The Mississippian Subsystem is made up of the Tournaisian deposited 3589 to 3467 million years ago Viséan 3467 to 3309 million years ago and Serpukhovian 3309 to 3232 million years ago stages whereas the Bashkirian 3232 to 3152 million years ago Moscovian 3152 to 307 million years ago Kasimovian 307 to 3037 million years ago and Gzhelian 3037 to 2989 million years ago stages make up the Pennsylvanian Subsystem