Discussion
................................ is one of the allochemical constituent of carbonate rocks that is formed within the depositional basin by fragmentation of penecontemporaneous, weakly cemented carbonate sediment.
Answer: D
The constituent is an intraclast.
In Folk's classification of limestones, intraclasts are fragments of penecontemporaneous, weakly consolidated carbonate sediment that were broken up and redeposited within the same basin, for example by storms tearing up a lime-mud crust. They are one of the four allochems, with ooids, fossils (bioclasts) and peloids.
Extraclasts (lithoclasts) come from older rocks outside the basin. Peloids are small, structureless grains, often faecal pellets, and bioclasts are skeletal fragments of organisms.
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