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This guidebook includes the San Diego Association Geologists' 2005 and 2006 field trips. We begin our exploration in the Peninsular Ranges Batholith in southern San Diego County along historic Old Highway 80 and the San Diego & Arizona Eastern Railway. The trip continues east over the Laguna Mountain Escarpment into the breakaway zone of the Salton Trough, mainly off road along rough jeep tracks and hiking trails.
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With its active fault systems, complex landforms, and myriad natural habitats, southern California boasts a rich and dynamic geologic environment. This abundantly illustrated volume at last provides an up-to-date, authoritative, and accessible resource for students and general readers interested in southern California's geology and native plants. Covering an extensive area, north from San Diego to Yosemite in the Sierra Nevada and east to the Mojave and Colorado deserts, its unique, comprehensive approach brings together for the first time the basic principles of geology, the story of plate tectonics, in-depth discussion of the geology of many specific locales within the region, and information on identifying southern California's native plants.
"This book includes petrology, geochronology, and regional aspects of individual plutons, as well as evolution of the Peninsular Ranges batholith. Several chapters deal with geophysical, chemical, and isotopic based interpretations of the genesis and evolution of the batholith. An accompanying DVD contains detailed colored maps and chemical, isotopic, mineralogic, and physical properties data"--Provided by publisher.
Surveyors called the San Diego and Arizona Railway (SD&A) "The Impossible Railroad" because of its jagged, mountainous, and brutal desert route. The financier and driving force behind building this binational 148-mile rail connection to the east from San Diego, California, was businessman John D. Spreckels. Because of his perseverance, the jinxed 1907-1919 construction overcame a series of disasters, including the Mexican Revolution, a prolonged lawsuit, floods, World War I, labor shortages, a tunnel cave-in, and a lethal pandemic. Once up and running, the line was intermittently in and out of service and later sold and renamed the San Diego and Arizona Eastern Railway. While "The Impossible Railroad" still faces constant challenges and partial closures, freight and trolley service currently operate on its right-of-way, and tourist excursions are offered at its Campo, California, depot.
Relations of Eocene volcaniclastic rocks and Eocene fossils date the sedimentary and structural evolution of the Southeast Absaroka Range, clarify correlations with adjacent areas, an aid in timing large-scale events of gravity faulting.