Editing Sedimentary rock (section)

=== Sedimentary facies ===
The kind of rock formed in a particular depositional environment is called its [[sedimentary facies]]. Sedimentary environments usually exist alongside each other in certain natural successions. A beach, where sand and gravel is deposited, is usually bounded by a deeper marine environment a little offshore, where finer sediments are deposited at the same time. Behind the beach, there can be [[dune]]s (where the dominant deposition is well sorted sand) or a [[lagoon]] (where fine clay and organic material is deposited). Every sedimentary environment has its own characteristic deposits. When sedimentary strata accumulate through time, the environment can shift, forming a change in facies in the subsurface at one location. On the other hand, when a rock layer with a certain age is followed laterally, the [[lithology]] (the type of rock) and facies eventually change.{{sfn|Tarbuck|Lutgens|1999|pp=158-160}}

[[File:Offlap & onlap EN.svg|thumb|upright=1.35|Shifting sedimentary facies in the case of [[transgression (geology)|transgression]] (above) and [[Marine regression|regression]] of the sea (below)]]

Facies can be distinguished in a number of ways: the most common are by the lithology (for example: limestone, siltstone or sandstone) or by [[fossil]] content. [[Coral]], for example, only lives in warm and shallow marine environments and fossils of coral are thus typical for shallow marine facies. Facies determined by lithology are called [[Facies|lithofacies]]; facies determined by fossils are [[biofacies]].{{sfn|Reading|1996|pp=19-20}}

Sedimentary environments can shift their geographical positions through time. Coastlines can shift in the direction of the sea when the [[sea level]] drops ([[Marine regression|regression]]), when the surface rises ([[transgression (geology)|transgression]]) due to tectonic forces in the Earth's crust or when a river forms a large [[River delta|delta]]. In the subsurface, such geographic shifts of sedimentary environments of the past are recorded in shifts in sedimentary facies. This means that sedimentary facies can change either parallel or perpendicular to an imaginary layer of rock with a fixed age, a phenomenon described by [[Walther's Law]].{{sfn|Reading|1996|pp=20-21}}

The situation in which coastlines move in the direction of the continent is called [[transgression (geology)|transgression]]. In the case of transgression, deeper marine facies are deposited over shallower facies, a succession called [[onlap]]. [[Marine regression|Regression]] is the situation in which a coastline moves in the direction of the sea. With regression, shallower facies are deposited on top of deeper facies, a situation called [[offlap]].<ref>For an overview over facies shifts and the relations in the sedimentary rock record by which they can be recognized, see {{harvnb|Reading|1996|pp=22–33}}.</ref>

The facies of all rocks of a certain age can be plotted on a map to give an overview of the [[palaeogeography]]. A sequence of maps for different ages can give an insight in the development of the regional geography.

====Gallery of sedimentary facies====
<gallery>

File:Facies_migration2.jpg | A regressive facies shown on a stratigraphic column

</gallery>