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Sedimentary rock is classified into three categories detrital, chemical/biochemical, and organic -based on their sedimentary processing. The sedimentary process is a result of the transport process by which the rocks become rounded as a consequence of some type of abrasion from being transport and deposited. Most commonly this occurs through weathering, rain, streamflow, erosion, or wind. The other forces that create sedimentary rock are generated from either chemical precipitation/crystallization or a process called lithification of what once was organic matter. This process involves the chemical breakdown of the source material that requires heat, dissolution, new minerals produced from the weathering process. The most significant characteristic of sedimentary rocks is the that are stratified. This means that sediments of any particular time period are arranged in a different layer that lays beneath and over equally different layers of time periods older and younger than itself.
Detrital
Detrital sedimentary rocks are a combination of conglomerate, sandstone, and shale/mudstone. These are primarily composed of other fragmented rocks. Based on the size they are subdivided into the various mentioned categories.
Conglomerates are consolidated gravel deposits with variable amounts of sand and mud between the pebbles and are the least abundant of sediment type. They are primarily found in mountain streams, along margins of mountain ranges. The source rock of a conglomerate can be readily determined by examining the lithology of the pebble (Minerals, Rocks & Rock Forming Processes, n.d.).
Sandstone comprise about 30% of all sedimentary rocks. It is much harder to identify the source rock of sandstone (as compared to conglomerate). The most abundant mineral found in sandstone is quartz since it is the hardest of the minerals formed in rocks, therefore, making it the most resistant to abrasion during transportation.
Shale/mudstone is a consolidation of mud. It comprises about 60-70% of the sedimmentary rocks on earth. Shale is not as exposed as sandstone due to its weaker composition. This sedimentary can be found in relatively still locations of deposition ( tidal flats, lakes, lagoons deep sea).
Chemical/Biochemical and Organic
Chemical and Organic Sedimentary rocks are the other main group of sediments besides clastic sediments. They usually form by inorganic or organic mediated mineral precipitation, and as the result of biological activity. Usually it takes some special conditions for these rocks to form, such as small or absent clastic sedimentation (would dilute chemical and organic input), high temperatures and high evaporation (cause supersaturation), and high organic activity (reefs, tropical swamps).
References
Lutgens, F. K., & Tarbuck, E. J. (2014). Foundation of Earth Science (7th ed.). Upper Saddle River, NJ: Pearson Education.

Minerals, Rocks & Rock Forming Processes. (n.d.). Retrieved July 10, 2016, from http://www.indiana.edu/~geol105/1425chap5.htm

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