(4) In oceanography, terrigenoussediments are those derivedfrom the erosion of rockson land; that is, they are derivedfrom terrestrial (as opposedto marine) environments.Consisting of sand,mud, and silt carried to sea byrivers, they are mainly depositedon the continental shelfandslopes. Terrigenous sedimentsthat reach the continentalshelf are often storedin submarine canyons on thecontinental slope. Turbiditycurrents carry them down intothe deep sea.