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talus
(redirected from astragal)

   Also found in: Dictionary/thesaurus, Wikipedia 0.09 sec.
talus (tā`ləs), deposit of rock fragments detached from cliffs or mountain slopes by weathering weathering, collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things. Some of these processes are mechanical, e.g.
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 and piled up at their bases. A talus is a common geologic feature in regions of high cliffs. The angle of slope of a talus is rarely greater than 40°. The constant weathering to which a talus is subjected, which breaks the rock fragments into finer pieces, and the impact of new material being added from above give the base of the talus a tendency to creep and slide. The term talus is often used to refer to the fragments themselves.


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