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Dotini
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#5
May19-11, 09:37 PM
PF Gold
P: 487
Mudstone is an argillaceous rock, similar to shale in non-plasticity, cohesion, and lower water content, but lacks the bedding plane fissility.
Source: Dictionary of Geology, Brooks and Whitten, Penguin, 1972.

Like shale, it may disintegrate when immersed in water. <--My interpretation.

Respectfully submitted,
Steve