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shale.info
"Shale is a fine-grained sedimentary rock whose original constituents were clays or muds..."
wiki
6,030,000 google returns
55,300 google images
OVT:
2848 barnett shale
1463 shale
1386 mark shale
982 oil shale
779 burgess shale
559 general shale brick
and more...
Any thoughts on value?

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