"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.

Light gray, earthy.

Brownish gray, kerogen-rich; commercial oil source.

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

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.

Red clastic rock composed of sand sized particles and hematite.

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