Clays, shales, sands, red and green marls, and alum shale, with occasional layers of "beef" (fibrous carbonate of lime) […] Chief "Beef" Beds, Dark (alum) shales with "beef" and selenite, beds of limestone, and layers of perished shells. Cyrena and Cyrides.

Corbula Beds. Layers of shelly limestone, shale, alum shale, and marl, with "beef" and selenite.