"WardsSci000452"

Gray to tan clastic rock made of silt sized particles.

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

Sale

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

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

Black, fissile; commonly with carbonized fossil plant impressions.

Light gray, fine small clasts.

Dense and massive.

Earthy, porous calcareous tufa.

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

Hematite-cemented quartz; orthoquartzite.