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Example of Sedimentary Rock

Sedimentary rock is formed by the impacting of sediments or particles into progressively tighter solids by gravity and the pressure of weight from materials above. Sediments are usually deposited by water action, like sand in a river. Over time the sand is compressed, forming a layer of materials which compresses further under the weight of additional deposits. At the point at which the compressed sand forms a true solid, it's described as a sedimentary rock. Sedimentary rocks may have other materials in their final structure, like conglomerates and breccia. Typically these rocks form as layered structures.

Examples of Sedimentary Rock:

Sandstone
Shale
Siltstone
Conglomerate
http://facstaff.gpc.edu/~pgore/geology/geo101/sedrx.htm
http://www.windows.ucar.edu/tour/link=/earth/geology/sed_intro.html
http://www.nicholas.duke.edu/eos/geo41/seds.htm
http://www.geo.ua.edu/intro03/seds.html
http://www.tulane.edu/~sanelson/geol111/sedrx.htm
http://facweb.bhc.edu/academics/science/harwoodr/geol101/labs/sediment/
http://www.uwgb.edu/dutchs/PETROLGY/Leaverite-SedFeat.HTM
http://en.wikipedia.org/wiki/Sedimentary_rock

Image Example of Sedimentary Rock:

Middle triassic marginal marine sequence of siltstones (below) and limestones (above), virgin formation, southwestern utah.

Outcrop of ordovician oil shale (kukersite), northern estonia.

Sedimentary-rock formation, karnataka, india.

Cyclic alternation of competent and less competent beds in the blue lias at lyme regis, southern england.