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Saint Marys Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Miocene
 .....Saint Marys Formation
RTVirginia
 Maryland
 Delaware
 Chesapeake Group
SNIn Chesapeake Group. Middle and upper Miocene. Delaware, E Maryland and E Virginia.