"Sedimentary Rock Specimens"

Typical green-gray, fissile, clay-rich.

Brownish black, intermediate stage between peat and bituminous coal.

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White, mature, friable.

Hardened natural cement of calcium carbonate that binds other material such as gravel, sand, clay, and silt.

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

Red, medium, to coarse-grained iron oxide cement; shows hematite bands.

Gray with line crinoid columnal fragments.

Light gray, fine small clasts.

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