Detritus (; adjective
detrital ) is particles of
rock derived from pre-existing rock through processes of
weathering and
erosion. A fragment of detritus is called a
clast. Detrital particles can consist of
lithic fragments (particles of recognisable rock), or of monomineralic fragments (mineral grains). These particles are often transported through
sedimentary processes into depositional systems such as riverbeds, lakes or the ocean, forming sedimentary successions.
Diagenetic processes can transform these sediments into rock through
cementation and
lithification, forming sedimentary rocks such as sandstone. These rocks can then in turn again be weathered and eroded to form a second generation of sediment.