- Key People:
- Joseph Barrell
- Johann Gottlob Lehmann
- Related Topics:
- clastic rock
- epigenesis
- syngenesis
- sedimentary structure
- chemical rock
- On the Web:
- Geosciences LibreTexts - Sedimentary Rocks (Oct. 29, 2026)
sedimentary rock
-
What is a sedimentary rock?
Sedimentary rocks are formed at or near Earth's surface from deposited and lithified mineral material. They are created through the weathering of existing rocks, followed by the transportation and deposition of these weathered products as sediment. This sediment can be composed of rock fragments, minerals, or precipitated chemicals.
Sedimentary rocks are broadly categorized into two main types:
* Terrigenous clastic sedimentary rocks: These are formed from fragments of pre-existing rocks and minerals, such as conglomerate, sandstone, siltstone, and shale.
* Chemical sedimentary rocks: These form from precipitation from a solution, like rock salt and gypsum, or from the secretions of organisms, such as limestone.Fossils are commonly found within sedimentary rocks. These rocks are significant as they contain most of the world's oil, natural gas, and coal deposits.
3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How do sedimentary rocks form?
Sedimentary rocks form through a process called lithification, which converts loose sediment into solid rock. This process involves the accumulation and compaction of mineral material, often derived from the weathering and erosion of pre-existing rocks. Minerals can be detrital, like quartz and feldspar, or authigenic, forming in situ such as calcite or halite. Cementation, where minerals precipitate in the pore spaces between grains, is a key part of lithification, along with chemical reactions and compaction. Sedimentary rocks are the most common rocks found at Earth's surface and are crucial for understanding Earth's history and containing valuable resources like oil and gas.
6 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What are some common examples of sedimentary rocks?
Common examples of sedimentary rocks include terrigenous clastic rocks like conglomerate, breccia, sandstone, siltstone, shale, claystone, and mudstone. These are formed from fragments of pre-existing rocks.
Other significant categories include:
* Carbonates: Primarily limestone and dolomite, formed from minerals like calcite and dolomite.
* Noncarbonate chemical sedimentary rocks: These can include cherts, phosphorites, evaporites (like rock salt and gypsum), and iron-rich rocks.
* Organic-rich deposits: Such as coal, formed from accumulated organic matter.While mudrock, sandstone, and carbonate rocks make up the bulk of exposed sedimentary rocks, their relative abundance can vary based on estimation methods.
3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What materials make up sedimentary rocks?
Sedimentary rocks are composed of two main types of minerals: detrital and authigenic. Detrital minerals, such as quartz and feldspar, are fragments of pre-existing rocks that survive weathering and are transported to the depositional site. Authigenic minerals, like calcite, halite, and gypsum, form in place within the depositional environment through geochemical processes. Clay minerals are also abundant and can be either detrital or authigenic. These sediments are then converted into rock through a process called lithification, which involves cementation and compaction. Sedimentary rocks can also form from chemical precipitation, such as rock salt and gypsum, or from organic sediment, like limestone formed from organisms' secretions.
4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
Where are sedimentary rocks usually found?
Sedimentary rocks are typically found at or near Earth's surface. They are formed by the accumulation and lithification of sediment, which can be detrital (fragments of other rocks) or precipitated from solutions. These rocks are commonly found in environments such as river deltas, alluvial fans, submarine fans, and the abyssal floors of ocean basins. They also occur along continental margins, in shallow marine zones, and in nonmarine settings like lakes and river valleys. While sedimentary rocks cover a large portion of Earth's surface, they constitute a minor part of the planet's total crust, which is dominated by igneous and metamorphic rocks.
5 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How do scientists use sedimentary rocks to learn about Earth's history?
Scientists use sedimentary rocks to understand Earth's history by examining their layers and the features within them. The principle of superposition states that in undisturbed layers, the oldest rocks are at the bottom, and younger ones are above. Sedimentary structures like ripple marks, mud cracks, and fossils provide clues about ancient environments, climates, and the evolution of life. Stratigraphy, the study of rock successions, uses these principles to create a timeline of Earth's history. By analyzing these rock sequences, geologists can reconstruct past geographies, understand geological events, and even locate resources like oil and natural gas.
6 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
sedimentary rock, rock formed at or near Earth’s surface by the accumulation and lithification of sediment (detrital rock) or by the precipitation from solution at normal surface temperatures (chemical rock). Sedimentary rocks are the most common rocks exposed on Earth’s surface but are only a minor constituent of the entire crust, which is dominated by igneous and metamorphic rocks.
Sedimentary rocks are produced by the weathering of preexisting rocks and the subsequent transportation and deposition of the weathering products. Weathering refers to the various processes of physical disintegration and chemical decomposition that occur when rocks at Earth’s surface are exposed to the atmosphere (mainly in the form of rainfall) and the hydrosphere. These processes produce soil, unconsolidated rock detritus, and components dissolved in groundwater and runoff. Erosion is the process by which weathering products are transported away from the weathering site, either as solid material or as dissolved components, eventually to be deposited as sediment. Any unconsolidated deposit of solid weathered material constitutes sediment. It can form as the result of deposition of grains from moving bodies of water or wind, from the melting of glacial ice, and 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 Earth.
Sedimentary rocks are the lithified equivalents of sediments. They typically are produced by cementing, compacting, and otherwise solidifying preexisting unconsolidated sediments. Some varieties of sedimentary rock, however, are precipitated directly into their solid sedimentary form and exhibit no intervening existence as sediment. Organic reefs and bedded 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: (1) terrigenous clastic sedimentary rocks and (2) allochemical and orthochemical sedimentary rocks.
" height="20" alt="HEW Logo">
Clastic terrigenous sedimentary rocks consist of rock and mineral grains, or clasts, of varying size, ranging from clay-, silt-, and sand- up to pebble-, cobble-, and boulder-size materials. These clasts are transported by gravity, mudflows, running water, glaciers, and wind and eventually are deposited in various settings (e.g., in desert dunes, on alluvial fans, across continental shelves, and in river deltas). Because the agents of transportation commonly sort out discrete particles by clast size, terrigenous clastic sedimentary rocks are further subdivided on the basis of average clast diameter. Coarse pebbles, cobbles, and boulder-size gravels lithify to form conglomerate and breccia; sand becomes sandstone; and silt and clay form siltstone, claystone, mudrock, and shale.
Chemical sedimentary rocks form by chemical and organic reprecipitation of the dissolved products of chemical weathering that are removed from the weathering site. Allochemical sedimentary rocks, such as many limestones and cherts, consist of solid precipitated nondetrital fragments (allochems) that undergo a brief history of transport and abrasion prior to deposition as nonterrigenous clasts. Examples are calcareous or siliceous shell fragments and oöids, which are concentrically layered spherical grains of calcium carbonate. Orthochemical sedimentary rocks, on the other hand, consist of dissolved constituents that are directly precipitated as solid sedimentary rock and thus do not undergo transportation. Orthochemical sedimentary rocks include some limestones, bedded evaporite deposits of halite, gypsum, and anhydrite, and banded iron formations.
Sediments and sedimentary rocks are confined to Earth’s crust, which is the thin, light outer solid skin of Earth ranging in thickness from 40–100 kilometres (25 to 62 miles) in the continental blocks to 4–10 kilometres in the ocean basins. Igneous and metamorphic rocks constitute the bulk of the crust. The total volume of sediment and sedimentary rocks can be either directly measured using exposed rock sequences, drill-hole data, and seismic profiles or indirectly estimated by comparing the chemistry of major sedimentary rock types to the overall chemistry of the crust from which they are weathered. Both methods indicate that Earth’s sediment-sedimentary rock shell forms only about 5 percent by volume of the terrestrial crust, which in turn accounts for less than 1 percent of Earth’s total volume. On the other hand, the area of outcrop and exposure of sediment and sedimentary rock comprises 75 percent of the land surface and well over 90 percent of the ocean basins and continental margins. In other words, 80–90 percent of the surface area of Earth is mantled with sediment or sedimentary rocks rather than with igneous or metamorphic varieties. The sediment-sedimentary rock shell forms only a thin superficial layer. The mean shell thickness in continental areas is 1.8 kilometres; the sediment shell in the ocean basins is roughly 0.3 kilometre. Rearranging this shell as a globally encircling layer (and depending on the raw estimates incorporated into the model), the shell thickness would be roughly 1–3 kilometres.
Despite the relatively insignificant volume of the sedimentary rock shell, not only are most rocks exposed at the terrestrial surface of the sedimentary variety, but many of the significant events in Earth history are most accurately dated and documented by analyzing and interpreting the sedimentary rock record instead of the more voluminous igneous and metamorphic rock record. When properly understood and interpreted, sedimentary rocks provide information on ancient geography, termed paleogeography. A map of the distribution of sediments that formed in shallow oceans along alluvial fans bordering rising mountains or in deep, subsiding ocean trenches will indicate past relationships between seas and landmasses. An accurate interpretion of paleogeography and depositional settings allows conclusions to be made about the evolution of mountain systems, continental blocks, and ocean basins, as well as about the origin and evolution of the atmosphere and hydrosphere. Sedimentary rocks contain the fossil record of ancient life-forms that enables the documentation of the evolutionary advancement from simple to complex organisms in the plant and animal kingdoms. Also, the study of the various folds or bends and breaks or faults in the strata of sedimentary rocks permits the structural geology or history of deformation to be ascertained.
The trusted destination for professionals, college students, and lifelong learners.
SUBSCRIBE
Finally, it is appropriate to underscore the economic importance of sedimentary rocks. For example, they contain essentially the world’s entire store of oil and natural gas, coal, phosphates, salt deposits, groundwater, and other natural resources.
Several subdisciplines of geology deal specifically with the analysis, interpretation, and origin of sediments and sedimentary rocks. Sedimentary petrology is the study of their occurrence, composition, texture, and other overall characteristics, while sedimentology emphasizes the processes by which sediments are transported and deposited. Sedimentary petrography involves the classification and study of sedimentary rocks using the petrographic microscope. Stratigraphy covers all aspects of sedimentary rocks, particularly from the perspective of their age and regional relationships as well as the correlation of sedimentary rocks in one region with sedimentary rock sequences elsewhere. (For further information about these fields, see geologic sciences.)