Intraclasts are grains that form by syndepositional reworking of partially lithified sediment. Theoretically, any lithology from the Folk or Dunham classifications may appear as an intraclast. Many intraclasts are composed of muddy lithologies that are more prone to seafloor lithification. Ooid intraclasts are also common in ooid shoal deposits, as are interaclasts of shelf-margin derived biolithites/boundstones in gravity-deposited slope and basinal sediments and turbidites.

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