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stratigraphic formations
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stratigraphic formations
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shales
Bakken shale
Barnett Shale
Chattanooga shale
Eagle Ford Formation
Fayetteville Shale
Haynesville Shale
Mancos shale
Marcellus Shale
radon in Marcellus shale formation
Monterey Shale
Niobrara shale
Utica shale
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