Rock Specimens

Represents a Wide Range of Depositional Environments and Rock Textures

Gray and poorly sorted, with a gritty texture.

Shale is a rich, gray fissile clay rock.

Sale

Earthy, porous calcareous tufa.

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

Hematite-cemented quartz; orthoquartzite.

Black, soft; most widely mined.

Gray to brown mudstone with abundant silt.

Typical green-gray, fissile, clay-rich.

Dense and massive.