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Journey with us as we descend into caves and mines, climb volcanoes, peer into craters, stand astride earthquake faults, trek over old lava, and search for fossils and gemstones. Our goal is to excite the imagination about geology and the natural world. For GPS afficionados and geocachers, we have included GPS coordinates to the trailheads.
Click on Trails to get virtual trail guides for your next adventure.
Robin C. Johnson and Dot Lofstrom, PG
Authors of Geology Trails of Northern California.