"gel box"

4 pounds of limestone chips supplied in a box.

Indicative of Various Sedimentary Formation Processes

Light gray, earthy.

Brownish gray, kerogen-rich; commercial oil source.

Well-cemented, medium-grained orthoquartzite.

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

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

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

Gray to buff, with numerous ooliths and fossil fragments.

Dense and massive.

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

Light gray, fine small clasts.

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

Earthy, porous calcareous tufa.

Hematite-cemented quartz; orthoquartzite.

Represents a Wide Range of Depositional Environments and Rock Textures