"WardsSci000452"

Cemented glacial gravel.

Useful for weathering and erosion, soil formation, porosity and permeability, or other general earth science labs.

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.

Massive sedimentary gypsum with a moh's hardness 2..