"Ward's Phenomena"

Typical green-gray, fissile, clay-rich.

Well-cemented, medium-grained orthoquartzite.

Light gray, fine small clasts.

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

Dense and massive.

Hematite-cemented quartz; orthoquartzite.

Black, soft; most widely mined.

Represents a Wide Range of Depositional Environments and Rock Textures

Breccia is a sedimentary rock made up of angular rock fragments.

Gray to tan clastic rock made of silt sized particles.

Limestone is a gray calcium carbonate that will fizz with dilute HCl.

Sale

Conglomerate is a sedimentary rock made up rounded quartz pebbles.

White, mature, friable.

Red clastic rock composed of sand sized particles and hematite.

Sale

Carbonate rock formed by the precipitation from water.

Sale

Scoria is a dark-colored rock formed from lava with a high gas content.