"WardsSci000452"

Red-brown to gray, coarse-grained, containing feldspar and mica.

Brownish black, intermediate stage between peat and bituminous coal.

Hematite-cemented quartz; orthoquartzite.

Gray to brown mudstone with abundant silt.

Typical green-gray, fissile, clay-rich.

Well-cemented, medium-grained orthoquartzite.

Brownish gray, kerogen-rich; commercial oil source.

Gray with line crinoid columnal fragments.

Buff, coarse, crystalline “Austin Marble” with shell casts and molds.

Gray, fine to medium-grained “Berea grit”.