intraclast

plural intraclasts

1. geographyA sediment formed by the redeposition of material erodes from an original deposit.

   In thin section the rock is composed of intraclasts (180/i modal diameter) and foraminifera (180/i modal diameter), in a matrix of microspar (4/i to 8/i diameter; mode 7fi.).

   1971, Journal of Sedimentary Petrology, page 716

   2 more examples

   The bodies of these beds typically show coarse-tail reverse grading of pumice and sedimentary intraclasts or coarse-tail normal grading of all clasts, although grading is absent in some of the intraclast-rich breccia beds.

   2000, Philip Martin Bethke, Ancient Lake Creede: Its Volcano-tectonic Setting, History of Sedimentation, and Relation to Mineralization in the Creede Mining District

   They are regarded as distal turbidites and are interbedded with bioclastic limestones and massive breccioid limestones containing blocks of coral colonies and intraclasts that are regarded as proximal turbidites.

   2007, Bernhard Hubmann, Fossil Corals and Sponges: Proceedings of the 9th International Symposium on Fossil Cnidaria and Porifera, Graz 2003