Sedimentary rocks are the result of deposition of sediment, often wind- or water-borne.

The obvious example to examine is the Grand Canyon.

http://www.edu-source.com/GCpages/CVOpage5.html and http://www.geo-images.com/atlas.html

http://www.kaibab.org/gc/geology/gc_layer.htm

These layers represent a progression in time, in this case with the oldest layers on the bottom and the youngest (most recently deposited) layers on top.

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