Mississippian Sub-period Bashkirien Bashkirien Pennsylvanian Sub-period Early Pennsylvanian Moscovian Age バシキリアン期 Bashkirium Carboniferous Period Bashkirium Bashkiriense baškir 巴什基尔期 bashkir Bashkiriano Early Pennsylvanian Epoch Serpukhovian Age Baškiiri Paleozoic Era Bashkirian Bashkirian Башкир Baszkir baskír baškirij Bashkiriën bashkiriano Phanerozoic Eon Geologic Time Scale (2018) a1.1.3.2.1.3 younger bound -315.2 +|-0.2 Ma Bashkirian Age Base of Middle Pennsylvanian Bashkir Bashkir Middle Pennsylvanian Epoch Base of Pennsylvanian older bound -323.2 +|-0.4 Ma