"WardsSci000452"

Brownish gray, kerogen-rich; commercial oil source.

Light gray, fine small clasts.

Dense and massive.

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

Black, fissile; commonly with carbonized fossil plant impressions.

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

Earthy, porous calcareous tufa.

Hematite-cemented quartz; orthoquartzite.

Brownish black, intermediate stage between peat and bituminous coal.

Gray to brown mudstone with abundant silt.