"The Mystery of Lyle and Louise"

Red, medium, to coarse-grained iron oxide cement; shows hematite bands.

Light gray, fine small clasts.

Gray to brown mudstone with abundant silt.

Red-brown to gray, coarse-grained, containing feldspar and mica.

Gray to buff, with numerous ooliths and fossil fragments.

Dense and massive.

Gray, fine to medium-grained “Berea grit”.

Hematite-cemented quartz; orthoquartzite.

Typical green-gray, fissile, clay-rich.

Black, soft; most widely mined.

Brownish black, intermediate stage between peat and bituminous coal.

1 pound of black sand packaged in a heat-sealed bag.