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.

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