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Organic Shales
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t
e
Organic Shales
Ph
Pz
C
M
Barnett Shale
New Albany Shale
D
Upper
Frasnian
Rhinestreet Formation
Middlesex Shale
Middle
Eifelian
Marcellus Shale
New Albany Shale
Marcellus Formation
O
Utica Shale
Point Pleasant Formation
