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Coalbed methane extraction
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== Interpretation of Ash analysis == [[Ash (analytical chemistry)|Ash]] is an important indicator of [[Clastic rock|clastic]] input, derived from [[Marine (ocean)|marine]] or [[fluvial]] deposition of [[clay]], [[silt]], and [[sand]] during [[peat]] development. Outcrop ash content appears to be less than the ash content of subsurface samples. Lower ash contents of outcrop samples may be due to coal deposits being up-dip and further away from a marine influence than samples down-dip.
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