The Maacama fault system and fracture zone lies at the heart of Mendocino County, defining the landscape of the central valleys and framing the geography, ecosystems, industry and culture of inland Mendocino. A sweeping and formidable tectonic corridor, this sister of the San Andreas Fault system delineates the valleys and towns of Laytonville, Willits, Ukiah, Hopland, and others along its path. Historic toponyms such as Long Valley and Little L…
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