"WardsSci000452"

Earthy, porous calcareous tufa.

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

Hematite-cemented quartz; orthoquartzite.

Brownish black, intermediate stage between peat and bituminous coal.

Gray to brown mudstone with abundant silt.

Typical green-gray, fissile, clay-rich.

White, mature, friable.

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

Gray with line crinoid columnal fragments.