Tag: "rhyolite"
Our Newest National Park: Pinnacles National Monument
This brand-new national park will be the closest one to the Bay Area. Let's get to know it.
Post on Jan 03, 2013 by Andrew Alden from QUEST Northern California
Geological Outings Around the Bay: Napa Glass Mountain
A Napa Valley roadcut was once a strategic resource center for the local inhabitants. Today it still draws visitors seeking out that resource: obsidian.
Post on Feb 02, 2012 by Andrew Alden from QUEST Northern California
