Middle Mississippian Epoch Serpukhoviën Bashkirian Age Serpukhov Serpukhov Serpukhovian Serpukhovium szerpuhovi Paleozoic Era Serpukhovien Serpukhovien サプコビアン期 younger bound -323.2 +|-0.4 Ma Serpukhovian Age Serpuchovis Late Mississippian 谢尔普霍夫期 Late Mississippian Epoch Phanerozoic Eon Pennsylvanian Sub-period Serpukoviano serpukhoviano Visean Age serpukhov a1.1.3.2.2.1 Early Pennsylvanian Epoch Base of Late Mississippian serpukhovij Serpuchow Geologic Time Scale (2018) Serpuhhovi serpuchov Serpukovium Serpulkhoviense Mississippian Sub-period Carboniferous Period Base of Pennsylvanian older bound -330.9 +|-0.2 Ma Серпухов