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.

We will come back to the idea and details of depositional environments.

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