. Bulletin. Science; Natural history; Natural history. 116 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES -35" 117°\ Desert Mountain Ranges o:\% Randsburg Ba rs t0 Ex planation '•^l;^- Mountain Range 3-*Q] 7 i-; Study Q uad rang le Name No of Basins 1 Saltdale NW 8 2 Garlock 15 3 Deadman Lake SE 5 4 Lead Mountain SW 11 5 Cleghorn Lakes 7 6 Whale Mountain 4 7 Chemehuevi Peak 18 \. Fig. 1. Location of the three study ranges. die or late Pleistocene age have been elevated by this tectonic event to form the highest terrace in the range. At the same time, a middle Pleistocene erosion surface experien
. Bulletin. Science; Natural history; Natural history. 116 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES -35" 117°\ Desert Mountain Ranges o:\% Randsburg Ba rs t0 Ex planation '•^l;^- Mountain Range 3-*Q] 7 i-; Study Q uad rang le Name No of Basins 1 Saltdale NW 8 2 Garlock 15 3 Deadman Lake SE 5 4 Lead Mountain SW 11 5 Cleghorn Lakes 7 6 Whale Mountain 4 7 Chemehuevi Peak 18 \. Fig. 1. Location of the three study ranges. die or late Pleistocene age have been elevated by this tectonic event to form the highest terrace in the range. At the same time, a middle Pleistocene erosion surface experienced renewed erosion and major south-flowing streams cut narrow, deep canyons (Dibblee 1952). Several of these topographic characteristics have been associated with active tectonism by Bull and McFadden (1977). Intrusive igneous rocks of Jurassic age, largely quartz diorites (Dibblee 1952), outcrop in the central portion of the southeastern mountain front where all of the sample basins were collected. Both the Bullion and the Chemehuevi Mountains are located in the Mojave Desert, although some writers would place the Chemehuevi Mountains in the Colorado Desert (Mazzucchelli 1967). Generalizations about the physiographic character of the subdivisions of the Basin and Range province usually suggest that the "older" ranges of the Mojave Desert have suffered considerably more erosion than the comparatively "younger" ranges, such as the El Paso Mountains, which lie north of the Garlock Fault in the Great Basin (Thornbury 1965; Lustig 1969). There is some topographic evidence that both the Bullion and the Che- mehuevi Mountains conform with this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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