HARTMAN MULTIMEDIA
Nature Based Multimedia Information Systems
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HARTMAN MULTIMEDIA
Nature Based Multimedia Information Systems |
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Los Osos Valley Volcanic Peaks Running southwest from Morro Bay to San Luis Obispo is a series of nine volcanic plugs, well exposed as a ridge of prominent domes on the northern edge of the Los Osos Valley. They run from Morro Rock inland to Islay Hill and include Black Hill and Cerro Cabrillo (see Morro Bay State Park), Hollister Peak, Cerro Romualdo, Chumash Peak, Bishop Peak and Cerro San Luis Obispo. These intrusive plugs were probably built along a northwest striking fault and are volcanic necks which cooled and solidified below the surface during the Miocene. Since then they have been uplifted and the surrounding country rock eroded away. The northern plugs are primarily dacite granophyres; the southern, andesite granophyres. Vegetation varies and is frequently sparse but there is some chaparral and a mixed evergreen community, the latter in the canyons. Two rare plants are found on the slopes of several of the plugs, Layia jonesii and Sanicula maritima. Integrity: Some of the area is grazed and there are roads, but most of the land is relatively undisturbed. Use: Private, save Black Hill and Western Cerro Cabrillo which are in Morro Bay State Park. July 1975 San Luis ObispoInventory of California Natural Areas Revision © 2005 Steven Louis Hartman
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