Fischer, Alfred G. Department of Geology, University of Southern California, Los Angeles, California.
Last reviewed:January 2020
- Derivation of sediment
- Sedimentary structures
- Classification of sedimentary rocks
- Historical content
- Related Primary Literature
- Additional Reading
Rocks formed of any of the materials that accumulate at Earth's solid surface at ambient temperatures, regardless of their consistency. Together with lava flows, sedimentary rocks form a cover of stratified material, known as the stratisphere, that, lying on igneous and metamorphic rocks, covers over two-thirds of the lands and nearly all of the ocean floor. Generally measured in hundreds to a few thousand meters, it locally reaches up to 15 km (9 mi) in thickness. See also: Earth; Igneous rocks; Metamorphic rocks; Rock
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