HARTMAN MULTIMEDIA
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HARTMAN MULTIMEDIA
Nature Based Multimedia Information Systems |
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Shadow Mountains In these relatively low-lying mountains two plant
communities are found, in almost equal proportions. There is the Mojave creosote
bush scrub and there is a Joshua tree woodland.
The Joshua tree, Yucca brevifolia var. jaegeriana, is near its western
limit here. Geologically, the area is of interest, as a number of
low-angle, almost horizontal thrust-fault plates are found here, where early
Pre-Cambrian crystalline rocks have thrust over Tertiary nonmarine strata and
flows. Within an area of 8
kilometers (5 miles) by 12 kilometers (8 miles), 24 plates (klippe) of
Pre-Cambrian granite gneiss have been observed, remnants of an extensive thrust
plate that rested upon the inclined Tertiary sediments. Use: Research,
educational, observational. Some
private. Ref: Hewett,
D. F. 1954.
General Geology of the Mojave Desert Region, California in Jahn, R. (ed.)
Geology of Southern California, Bull. 170 Calif. Div. of Mines, San Francisco,
pp. 5-20. December 1976
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