clast


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  • noun

Words related to clast

(geology) a constituent fragment of a clastic rock

References in periodicals archive ?
Lithic clasts in boulder, cobble, pebble, and granule conglomerates of the proximal Daggett Ridge Formation were derived from Late Cambrian through Early Ordovician sedimentary and volcanic rocks of the Miramichi terrane and are also present locally in dark grey to pebble conglomerate and lithic sandstone of the Mill Privilege Brook Formation (along with black pyritiferous shale).
The abundance of quartz and quartzite, extrabasinal clasts indicates that the sedimentary environment was connected to an extrabasinal provenance and were not isolated tidal channels (Fig.
Following the method of Sheridan and Marshall (1983), the most representative grain size classes were first examined by stereomicroscope to distinguish glass, lithics, and crystals, and subsequently were cleaned by a weak 30 second ultrasonic treatment in distilled water, which did not modify the original features of the clasts.
The B2 horizon is underlain by a horizon containing numerous, large ferruginous sandstone clasts (CB) and a C horizon which contains smaller, less Fe-rich sandstone fragments in a medium clay matrix.
They also pointed out that a glacial dispersion train, which extends more than 8 km southwest of Buchans, contains mineralized clasts or erratics.
This effort will continue under the auspices of CLAST in 2010-11.
The mean of 10 largest clasts (grain > 2 mm) in each sample was taken as [D.
The CLAST is an achievement test that measures selected communication and mathematics skills adopted by the State of Florida Board of Education.
For example, staff at the Information Center may now look up events in alphabetical sequence to see when and where the CLAST is being held.
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.
Outcrop based identified lithofacies in Tobra Formation are; unstratified clast supported conglomerate (Gem), massive diamictite facies (Gmm), stratified diamictite facies (Gmm), massive sandstone facies (Sm) and massive mudstone facies (Fm).
Clast type 1 ranges from mudstone to wackestone with a relatively diverse assemblage of micro-ooids, fine echinoderm fragments, sponge spicules and fine abraded shell material.
Coarse gravel and pebbles are mostly cemented by thin carbonate crusts or coatings around the clast surface, which act like glue sticking them together.