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This book is for the San Francisco Bay area residents and visitors who want to explore the geologic world of this spectacular area, to learn about its shapes, colours, and rocky foundations. Doris Sloan illuminates the colourful geologic mosaic that surrounds San Francisco Bay and lucidly explains the complex and fascinating processes that have forged it over millions of years. In a lively and engaging style, Sloan describes forces such as the movement of tectonic plates, erosion, the waves on the coast, and human activity. Background information on the processes, time frame, and rocks that are the key to understanding the Bay Area landscape and geologic history are also provided.