"WardsSci000452"

Black, soft; most widely mined.

Well-cemented, medium-grained orthoquartzite.

Gray and poorly sorted, with a gritty texture.

Buff-colored, coarse, detrital limestone, with cemented shell fragments.

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

Dense and massive.

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

Black, fissile; commonly with carbonized fossil plant impressions.

Light gray, fine small clasts.

Small, rounded pebbles and tightly cemented granules.