The New Albany Shale in Indiana is dominantly brownish-black, carbon-rich quartzose, dolomitic, pyritic shale. Greenish-gray carbon-poor shale, dolomite and sandstone also are present. In descending order, theClegg Creek Member, Camp Run Member, Morgan Trail Member, Selmier Member, and Blocher Member are named. The lower two members are widely traceable in the subsurface. The Antrim Shale, Ellsworth Shale, and Sunbury Shale, together equivalent to the New Albany, are recognized in the Michigan basin of northern Indiana. The New Albany Shale was deposited in a widespread inland sea, characterized by quiet water that probably was deep in places. The organic matter was derived from a floating mat of algae and accumulated under reducing bottom conditions that were inimical to benthonic faunas.

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