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- Fine-grained,
detrital sedimentary rock made up of
silt- and clay-sized particles. Distinguished from
shale by lack of
fissility.
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- a. An indurated mud having the texture and composition of shale, but
lacking its fissility; a blocky or massive, fine-grained sedimentary rock
in which the proportions of clay and silt are approx. equal; a nonfissile
mud shale. See also: claystone; siltstone. AGI
b. A general term that includes clay, silt, claystone, siltstone, shale,
and argillite. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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