In geology, rocks or sections or units of rocks which have been moved from their original site of formation are called allochthon (from greek 'allo' = other, and 'chthon' = earth). In the case of sediments this means that they can be found today at a different location from their site of deposition. Mostly a longer distance of transport has taken place. Transport is mostly accomplished by a tectonic process, or i.e. gravitational sliding. Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. ... Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ...

See also: Autochthon, Tectonics Look up autochthonous in Wiktionary, the free dictionary. ... The tectonic plates of the world were mapped in the second half of the 20th century. ...