Coalification

The geochemical process that transforms plant material into coal is called coalification and is often expressed as:

peat ^ lignite ^ subbituminous coal ^ bituminous coal ^ anthracite

This is a simplistic classification; more elaborate systems have evolved and are discussed in the next section. Coalification can be described geo-chemically as consisting of three processes: the microbiological degradation

Era

Palaeozoic

Mesozoic

Cenozoic

Period

Carboniferous

| Permian

Triassic |

Jurassic Cretaceous

Tertiary ¡Quaternary

Lignite

Lignite

COLOMBIA/VENEZUELA •

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