I lived at the base of the Sutter Buttes between 2009 and 2011. Known as 'the smallest mountain range in the world', the buttes are actually an extinct caldera. They are a unique geological formation in the middle of the Sacramento Valley, which is otherwise completely flat.
The Buttes hold natural gas, and the fracking of wells began in earnest shortly before I moved back to the Bay Area. I recently drove through the Buttes, and all of the wells have been drilled and tapped. Made me thankful I stopped one afternoon to make these few pictures.