"WardsSci000452"

Black, fissile; commonly with carbonized fossil plant impressions.

Dense and massive.

Fine, common limestone; massive, and will fizzle with HCl.

Light gray, fine small clasts.

Small, rounded pebbles and tightly cemented granules.

Earthy, porous calcareous tufa.

Hematite-cemented quartz; orthoquartzite.

Brownish black, intermediate stage between peat and bituminous coal.

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

White, mature, friable.