Deposition (geology)
Deposition, also known as
sedimentation, is the
geological process whereby material is added to a
landform. This is the process by which wind, water or ice create a
sediment deposit, through the laying down of granular material that has been
eroded and
transported from another geographical location.
Deposition occurs when the forces responsible for sediment transportation are no longer sufficient to overcome the forces of particle weight and friction, which resist motion. Deposition can also refer to the build up of a sediment from organically derived matter or chemical processes. For example,
chalk is made up partly of the microscopic
calcium carbonate skeletons of marine
plankton, the deposition of which has induced chemical processes (
diagenesis) to deposit further calcium carbonate.
*
Cementation*
Cross bedding*
Diagenesis*
Overbank*
Sedimentary rock
