Geology How to find the hidden 'elephant' at Point Bonita Lighthouse In the rough waters beneath the iconic Point Bonita Lighthouse sits a 180-million-year-old rock that geologists from all over the world travel to marvel at. The power of serpentinite, California's state rock California's state rock serpentine has two real powers: the ability to host rare and unique vegetation and its potential to help climate change. San Francisco rocks! The fascinating history behind Bay Area geology San Francisco’s most unique and interesting attribute might be the Bay Area’s geology.
