. Bulletin. Science; Natural history; Natural history. HERPETOFAUNA OF THE VIZCAINO PENINSULA, BAJA CALIFORNIA 47. Fig. 2. Study area within the continental portion of the Vizcaino Peninsula. rising to between 600 and 1010 m in elevation above the flat, lowland, central portion of the Vizcaino Desert. These mountains extend approximately 12 km northwest to southeast and are separated by one large and several smaller arroyos. North of the Sierra Santa Clara and south of the Sierra Vizcaino lies the west- ernmost edge of the Vizcaino Desert. As elsewhere, this portion of the Vizcaino Desert is p
. Bulletin. Science; Natural history; Natural history. HERPETOFAUNA OF THE VIZCAINO PENINSULA, BAJA CALIFORNIA 47. Fig. 2. Study area within the continental portion of the Vizcaino Peninsula. rising to between 600 and 1010 m in elevation above the flat, lowland, central portion of the Vizcaino Desert. These mountains extend approximately 12 km northwest to southeast and are separated by one large and several smaller arroyos. North of the Sierra Santa Clara and south of the Sierra Vizcaino lies the west- ernmost edge of the Vizcaino Desert. As elsewhere, this portion of the Vizcaino Desert is principally flat and featureless except for a few small volcanic mesas of low elevation, offering only a small degree of topographical relief (Fig. 3). The Sierra Vizcaino is a much larger mountain range than the Sierra Santa Clara and separated from it by approximately 50 km of open desert (Fig. 2). The Sierra Vizcaino extends 115 km from Bahia Asuncion in the southeast, tapering to Punta Eugenia in the northwest and reaches 900 m in elevation. Like the Sierra Santa Clara, the formation of the Sierra Vizcaino is the result of Miocene volcanic deposition and the range has been aerial since the beginning of the formation of the Gulf of California (Gastil and Jensky 1973). The Vizcaino Peninsula extends northwestward from Punta Eugenia in the form of the islands Natividad, Cedros, and San Benitos. Islas Natividad and Cedros are landbridge islands that have had an aerial connection with one another and the Sierra Vizcaino within the last 10,000 years (Milliman and Emery 1968; Wilcox 1980). Islas San Benitos, which is composed of three relatively small closely proximate islets, is of continental origin (Crouch 1979) and it is not known if it has ever been connected to Isla de Cedros. The climate of the Vizcaino Peninsula is strongly influenced by the cold Cali- fornia Current flowing southward along the west coast of North America. Asso-. Please note that these images are extracted
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