GY 111 Lecture Note Series Sediment, sedimentary rocks and ...
GY 111 Lecture Notes D. Haywick (200809) 1 ... Peat, 2) lignite (or brown coal), 3) bituminous coal and 4) anthracite. The rank of a coal is essentially how much carbon it contains. Peat is a low rank "coal" that is brown to reddish brown because it contains little carbon. It is largely composed of