"WardsSci000452"

Great for biology and sediment studies.

4 pounds of limestone chips supplied in a box.

Cemented glacial gravel.

Compact Plant Fiber Masses.

Black, soft; most widely mined.

Gray and poorly sorted, with a gritty texture.

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

Light gray, earthy.

Gray to buff, with numerous ooliths and fossil fragments.

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

Black, fissile; commonly with carbonized fossil plant impressions.

Dense and massive.

Earthy, porous calcareous tufa.

Small, rounded pebbles and tightly cemented granules.

Hematite-cemented quartz; orthoquartzite.

Brownish black, intermediate stage between peat and bituminous coal.