Editing Sedimentology (section)

==Sedimentary rock types==
[[Image:Triassic Utah.JPG|thumb|right|Middle [[Triassic]] marginal marine sequence of siltstones and sandstones, southwestern [[Utah]].]]
There are four primary types of [[sedimentary rocks]]: clastics, carbonates, evaporites, and chemical.
* [[Clastic rocks]] are composed of particles derived from the [[weathering]] and [[erosion]] of precursor rocks and consist primarily of fragmental material. Clastic rocks are classified according to their predominant [[Particle size|grain size]] and their composition.  In the past, the term "Clastic Sedimentary Rocks" were used to describe silica-rich clastic sedimentary rocks, however there have been cases of clastic carbonate rocks. The more appropriate term is [[siliciclastic]] sedimentary rocks.
** Organic sedimentary rocks are important deposits formed from the accumulation of biological detritus, and form [[coal]] and [[oil shale]] deposits, and are typically found within [[Depression (geology)|basins]] of clastic sedimentary rocks
* [[Carbonate rocks|Carbonates]] are composed of various [[carbonate minerals]] (most often [[calcium carbonate]] (CaCO<sub>3</sub>)) precipitated by a variety of organic and inorganic processes. 
* [[Evaporite]]s are formed through the evaporation of water at the Earth's surface and most commonly include [[halite]] or [[gypsum]].<ref>Edward J. Tarbuck, Frederick K. Lutgens, Cameron J. Tsujita, ''Earth, An Introduction to Physical Geology'', National Library of Canada Cataloguing in Publication, 2005, {{ISBN|0-13-121724-0}}</ref>
* Chemical sedimentary rocks, including some carbonates, are deposited by precipitation of minerals from aqueous solution. These include [[jaspilite]] and [[chert]].