Parameter Tree:
EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > WETLANDS > PEATLANDS

Definition:
Peatlands are areas formed by a brown mass of organic matter in which
twigs, roots, and other plant parts can still be recognized. These areas
formed due to lack of enough oxygen to decay vegetation completely on
land. Peatlands form in fresh-water swamps, indicated by the plant
fossils.  


Reference:
Press, F. and R. Siever. 1978. Geology. W.H. Freeman and Company. San
Francisco.