Benthic Foraminifer FAD Eoparastaffella simplex Base of Middle Mississippian Base of Visean Stratotype Point Base of Middle Mississippian Base of bed 83 in the Pengchong Section Stratotype Point Base of Visean true Pengchong, south China Location of Stratotype Point Base of Middle Mississippian Ratified 2008 Episodes 26/2, p. 105 –115, 2003 Stratotype Point Base of Visean