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t
e
Chronostratigraphy
of
Maryland
Ph
Pz
C
M
Serpukhovian
Greenbrier Formation
Mauch Chunk Formation
Viséan
Greenbrier Formation
Purseland Sandstone
Tournaisian
Purseland Sandstone
Rockwell Formation
D
Upper
Famennian
Hampshire Formation
Rockwell Formation
Frasnian
Brallier Formation
Foreknobs Formation
Greenland Gap Group
Harrel Shale
Scherr Formation
Middle
Givetian
Mahantango Formation
Eifelian
Marcellus Shale
Needmore Shale
Lower
Emsian
Helderberg Formation
Mandata Shale
Needmore Shale
Oriskany Sandstone
Shriver Chert
Pragian
Corriganville Limestone
Helderberg Formation
Lochkovian
Keyser Limestone
New Creek Limestone
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