Matrix-supported rock

In geology, a matrix-supported rock is a sedimentary rock of which a defined majority is the fine-grained matrix as opposed to the clasts (in the case of a conglomerate) or allochems (in the case of a limestone). For a conglomerate, a rock is considered matrix-supported when clasts constitute less than 15% of its volume. Matrix support is considered characteristic of debris flow deposits, in which clasts are supported within a fabric of mud as they move downstream.{{cite journal|last1=Leigh|first1=Sebastian|last2=Hartley|first2=Adrian J.|title=Mega-debris flow deposits from the Oligo-Miocene Pindos foreland basin, western mainland Greece: implications for transport mechanisms in ancient deep marine basins|journal=Sedimentology|volume=39|issue=6|pages=1003|year=1992|doi=10.1111/j.1365-3091.1992.tb01993.x|bibcode = 1992Sedim..39.1003L }} Wackestones and mudstones under the Dunham classification of limestones are also considered matrix-supported due to the predominance of micrite (as opposed to, for example, macrofossils).