The Topographic And Geologic Atlas of the United States
The Topographic And Geologic Atlas of the United States
Geological Survey (U .S.), Geological Survey (U.S.
The book The Topographic And Geologic Atlas of the United States was written by author Geological Survey (U .S.), Geological Survey (U.S. Here you can read free online of The Topographic And Geologic Atlas of the United States book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Topographic And Geologic Atlas of the United States a good or bad book?
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Cambrian ..
Algonkian..
Archean Series.
(Recent ) t Pleistocene . . . | f Pliocene ^ (Miocene !
Oligocene f Eocene J r Permian ] < Pennsylvanian |^ [.Mississippian.. J Sym- bol.
Color for sedi- mentary rocks.
Brownish yellow.
Ocher-yellow.
Olive-green.
Blue-green.
Peacock-blue.
Blue.
Blue-gray.
Blue-purple.
Red-purple.
Brick-red.
Brownish red.
Gray-brown.
SURFACE FORMS.
Hills, valleys, and all other surface forms have been produced by geologic processes. For example, most valleys are the result of erosion by the streams that flow through them (see fig. 1), and the alluvial plains bordering many streams were built up by the streams; waves cut sea cliflFs and, in cooperation with currents, build up sand spits and bars. Topographic forms thus constitute part of the record of the history of the earth.
Some forms are inseparably connected with deposition. The hooked spit shown in figure 1 is an illustration. To this class belong beaches, alluvial plains, lava streams, drumlins (smooth oval hills composed of till), and moraines (ridges of drift made at the edges of glaciers).
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