Class: Sedimentary

Subclass: Clastic

Rock: Shale

General Characteristics: Composed of very fine-grained sediments; typically thinbedded.

Rock: Sandstone

General Characteristics: Composed of sand-sized sediments.

Rock: Conglomerate

General Characteristics: Composed of rounded, pebble-sized sediments in a fine-textured matrix.

Rock: Breccia

General Characteristics: Composed of coarse-grained, angular, sediments; typically thin bedded poorly-sorted fragments.

Subclass: Chemical and Organic

Rock: Limestone

General Characteristics: Composed of calcite; may contain shells or shell fragments

Rock: Travertine

General Characteristics: Limestone depostied in caves or around hot springs; often deposited in banded layers.

Subclass: Chemical and Organic

Rock: Chert

General Characteristics: Common chemical rock composed of microcrystalline quartz.

Rock: Coal

General Characrteristics: Composed of compacted plant material