Publisher's Synopsis
Excerpt from The Underground Water of the Arkansas Valley in Eastern Colorado
The principal rocks are shales, sandstones, and limestones, which alternate with one another in a series of layers. Each layer or forma tion is very broad, extending for scores or hundreds of miles, but is of comparatively small thickness. One rests on another like the leaves of a book. Each formation was originally a soft sediment at the bottom ofa sea or ocean. The shale was mud; the sandstone was sand; the limestone was limy ooze. These sediments were brought to the ocean from neighboring lands by rivers, and were spread over the ocean bot tom by ocean currents. The extent of the ocean was changed from time to time, and changes occurred in the character of the rivers; and in consequence of these changes the character of sediment was not always the same. Mud, limy ooze, and sand were deposited in alter nation, building up a varied series of layers. Afterward, by pressure or by chemical changes, the sediments were hardened into rocks such as are now found.
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