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Compression and hardening over long periods of time, the processes by which coal is formed from plant materials.


the compression, over time, of plant matter into coal


(ˌkoʊ lə fɪˈkeɪ ʃən)

the conversion of plant material into coal by natural processes, as by diagenesis and, in some instances, metamorphism.
References in periodicals archive ?
Cleats are linear discontinuities in coal forming a structural fabric in coal cleats are produced as a result ofphysical changes and tectonic stress during coalification.
It was also utilized to determine the degree of coalification by measuring the percentage of reflectance in reflected light (Valentim et al.
Unconventional gas in coal measures is all natural gasses which are generated through evolution when the parent materials of source rocks underwent coalification of biochemistry and physiochemistry.
Tectonostratigraphic relationships and coalification trends in the Narragansett and Norfolk basins, New England.
The organic carbon content of coal increases gradually with increasing coalification degree.
Large amounts of methane formed during the coalification process and stored in coal seams are released in the mine workings gradually as mining progresses.
6 Pre Coalification Details For The Said Enquiry Is Enclosed.
Ibarra JV, Munoz E, Moliner R (1996) FTIR study of the evolution of coal structure during coalification process.
During coalification, peat undergoes several changes as a result of bacterial decay, compaction, heat and time.
In this E-W elongated basin, a high heat flow was responsible for coalification of many lacustrine coal beds sandwiched in coarse grained fluvial to deltaic deposits (Becq-Giraudon, 1973; Saint-Martin, 1993).