clast

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Related to clasts: clastic rock, Lithification

clast

[klast]
(geology)
An individual grain, fragment, or constituent of detrital sediment or sedimentary rock produced by physical breakdown of a larger mass.
References in periodicals archive ?
The 5 cm wide fracture is filled with unbedded silty sandstone containing abundant small angular clayey-silty clasts.
The breccia that directly overlies the exposure surface is composed of dolostone clasts containing dolomite petrographically identical to that in the Fenestral Lithofacies.
Palynology: Palynodebris are organic clasts which behave like sedimentary particles, and therefore give information about rock facies and depositional conditions.
When the soil thaws, the rock settles down, but not quite as far, so that after a number of seasons the combined action of the soil convection and the clast movement results in a sorted pattern.
In the Grand Bay Formation there is a suite of autochthonous burrows and trails indicative of the deeper-water depositional environment supplemented by bored clasts derived from shallower water.
We believe that rapid burial contributed to its excellent condition, despite its intimate association with fire-cracked rocks and other clasts.
These clay-enriched samples were then placed on a rotary table at 110 rpm for 24 hours to disaggregate clay clasts and wet sieved through a 38 [micro]m (64) screen.
The breccias contain abundant carbonate clasts and some sphalerite clasts.
Large clasts (xenoliths) of Chim formation sediment occur within the intrusive.
Broken, rotated and rounded clasts are a clear indication of exposure, desiccation, and reworking during the next high tide.
the diamondiferous gravels also contain clasts, reminiscent of the rim-rocks