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What is a clast?

What is a clast? Here are some definitions.

Noun
  1. (geology) a fragment of rock that was broken from a larger rock or rock unit.
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Examples
A large, angular semi-pelite clast contains two tectonic fabrics, one of which is parallel to bedding within the clast whereas the other is oblique to it.
A terminal grade is the smallest grain size to which an entrained clast may be reduced by crushing and abrasion under a glacier.
A very few clast imbrications at Robins show transport from the north, suggesting that transport directions are also unchanged.
Clast lithology map showing contoured percentages of Archean granitoid pebbles in till.
Graded bedding, in which size decreases from bottom to top, is common: because agitated waters rarely subside at once, declining transport power causes a gradual upward decrease in maximum clast size.
It is noteworthy that CLAST members will save money in adopting hands-on, inquiry-driven science kit curricula.

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