"Sedimentary Rock Specimens"

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

Red clastic rock composed of sand sized particles and hematite.

Sale

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.

Small, rounded pebbles and tightly cemented granules.

Hematite-cemented quartz; orthoquartzite.