a. A channel or channellike feature produced in a sedimentary deposit by the scouring action of flowing water and later filled with the sediment of a younger deposit. Syn: scour and fill
b. A channel cut into or through a coal seam at some time during or after the formation of the seam, generally filled with sandstone--or more rarely with shale--similar to that of the roof. See also: cutout; horseback; want; low. Raistrick; AGI
c. Barren, thin, or jumbled areas in coal seams in which there is no actual disruption and no vertical displacement of the coal and strata. These disturbances may be divided into three main types; namely (1) classical washouts, (2) pressure belts, and (3) tremor tracts. Authentic washouts should be restricted to the first group. Also called rock fault; nip. See also: roll
d. Local thinning or disappearance of a coal seam due to erosion during or shortly after its formation. BS, 11
e. Channellike features that cut or transgress the stratification of the underlying beds; may be small scour-and-fill structures or large erosional channels. Also called cutout. Pettijohn, 1
Source:
Dictionary of Mining, Mineral, and Related Terms












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