"WardsSci000452"

Specially selected subsoil, 1 lb.

Great for biology and sediment studies.

Specially selected topsoil, 1 lb.

4 pounds of limestone chips supplied in a box.

Gray to buff, with numerous ooliths and fossil fragments.

Mix designed to experiment with confined clay.

Cemented glacial gravel.

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

Dark, waxy, bitumin-rich.

Black, soft; most widely mined.