Compilers: Maurice J. Terman, William E. Bowers, George Soleimani, Maurice J. Terman, and Ching Chang Woo
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Earth's crust can be divided into principal regions on the basis of differences in its state of tectonic mobility, and further subdivided into regions on the basis of differences in its gross physiographic and structural characteristics. All regions exhibit at least partial development of a tectonic cycle, most have undergone continuing deformation for a long time, and some have been deformed by several orogenic cycles. On the map, the age of folding most important in tectonic development, the age of the last important metamorphism, the age of intrusion, or the principal post-orogenic deposition are shown by color. Lithology is shown by pattern or map boundaries. Sedimentary and volcanic rocks deposited on the foldbelts are shown in many places on the map. These rocks are thick basin deposits formed as a result of crustal movements in foldbelts, or are sedimentary and volcanic rocks of various ages that form relatively thin deposits on broad tectonically stable regions. Tectonic features and rock units are shown in their present outcrop position as indicated in geologic source material available in 1966.
Published: 4/01/1974
Pages: 2 sheets
Product Category: Maps and Charts