From deep underground to right out in the open, Sonoma County’s geologic heritage is varied and fascinating. A special series of hikes next weekend offers close-up looks at some highlights, with explanations from a knowledgeable guide.
Another aspect of Sonoma County's recent geologic history--one that won't be featured in Melosh's transect hikes--is the mining that was active year in decades past. Evidence of that, especially for mercury, remains plentiful, but may be hazardous.
The geology transect is a benefit for the Sonoma Land Trust, and includes visits to several sites that have been preserved by the Trust.