"WardsSci000452"

Compact Plant Fiber Masses.

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.

Gray to tan clastic rock made of silt sized particles.

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

Shale is a rich, gray fissile clay rock.

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