Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known as 'clastic' sedimentary rocks); by the accumulation and the consolidation of sediments; by the deposition of the results of. Sedimentary rock, rock formed at or near the Earth's surface by the accumulation and lithification of sediment (detrital rock) or by the. In that case, sedimentary rocks are derived rocks because they are formed from Sedimentary rocks are the product of 1) weathering of preexisting rocks.


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It can form as the result of deposition of grains from moving bodies of water or windfrom the melting formation of sedimentary rocks glacial iceand from the downslope slumping sliding of rock and soil masses in response to gravity, as well as by precipitation of the dissolved products of weathering under the conditions of low temperature and pressure that prevail at or near the surface of the Earth.

Sedimentary rocks are the lithified equivalents formation of sedimentary rocks sediments. They typically are produced by cementing, compacting, and otherwise solidifying preexisting unconsolidated sediments.

Sedimentary Rocks

Some varieties of sedimentary rock, however, are precipitated directly into their solid sedimentary form and exhibit no intervening existence as sediment. Organic reefs and formation of sedimentary rocks evaporites are examples of such rocks.

Because the processes of physical mechanical weathering and chemical weathering are significantly different, they generate markedly distinct products and two fundamentally different kinds of sediment and sedimentary rock: Flint is a hard, tough, chemical or biochemical sedimentary rock that breaks with a conchoidal fracture.

It often forms formation of sedimentary rocks nodules in sedimentary rocks such as chalk and marine limestones.

Sedimentary Rock Formation

Dolomite also known formation of sedimentary rocks "dolostone" and "dolomite rock" is a chemical sedimentary rock that is very similar to limestone. It is thought to form when limestone or lime mud is modified by magnesium-rich ground water. The specimen shown above is about four inches ten centimeters across.

Limestone is a rock that is composed primarily of calcium carbonate. It can form organically formation of sedimentary rocks the accumulation of shell, coral, algal, and fecal debris.

Erosion The combination of weathering and movement of the resulting sediments is called erosion. Lithification Lithification is the changing of sediments into rock.

  • Sedimentary Rocks | Pictures, Characteristics, Textures, Types
  • Sedimentary rock - Wikipedia
  • Sedimentary Rock Formation
  • Formation of Sedimentary Rocks
  • Sedimentary rock

There are two processes involved in this change. Examples of continental environments formation of sedimentary rocks lagoonslakes, swampsfloodplains and alluvial fans. In the quiet water of swamps, lakes and lagoons, fine sediment is deposited, mingled with organic material from dead formation of sedimentary rocks and animals.

In rivers, the energy of the water is much greater and can transport heavier clastic material. Besides transport by water, sediment can in continental environments also be transported by wind or glaciers.


Sediment transported by wind is called aeolian and is always very well sortedwhile sediment transported by a glacier is called glacial till and is characterized by very poor sorting. The depositional formation of sedimentary rocks of the Touchet Formationlocated in the Northwestern United Stateshad intervening periods of aridity which resulted in a series of rhythmite layers.

Erosional cracks were later infilled with layers of soil material, especially from aeolian processes. The infilled sections formed vertical inclusions in the horizontally deposited layers of the Touchet Formation, and thus provided evidence of the events that intervened over time among the forty-one layers that were deposited.

Formation of sedimentary rocks 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.

Pictures of Sedimentary Rocks

Behind the beach, there can be dunes where the dominant deposition is well sorted sand or a lagoon where fine formation of sedimentary rocks and organic material is deposited. Every sedimentary environment has its own characteristic deposits.

The typical rock formed in a certain environment is called its sedimentary facies. 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.

Coralfor 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 lithofacies ; facies determined by fossils are biofacies.

Coastlines can shift in the direction of the sea when the sea level drops, when the surface rises due to tectonic forces in the Earth's crust or when a river formation of sedimentary rocks a large delta.

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