"gel box"

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

Hematite-cemented quartz; orthoquartzite.

Earthy, porous calcareous tufa.

Represents a Wide Range of Depositional Environments and Rock Textures

Brownish black, intermediate stage between peat and bituminous coal.

White, mature, friable.

Small, rounded pebbles and tightly cemented granules.

Buff, coarse, crystalline “Austin Marble” with shell casts and molds.

Gray to brown mudstone with abundant silt.

Well-cemented, medium-grained orthoquartzite.