This booklet was put together for attendees of the 1979 American Geophysical Union’s annual meeting in San Francisco, a guide to seven trips in the area where you could hop on a streetcar (or BART) and check out some amazing rocks. After a quick recap of plate tectonic theory, subduction explanation, and overview of rock types (serpentine, sandstone, shale, chert, basalt, gabbro), he dives into the various MUNI lines and trips around the city. Trip 1 takes you from Billy Goat Hill in the Mission (basalt, chert, and greywacke exposed) to Corona Heights to the New Mint outcrop (“This is probably the most beautiful and informative outcrop of serpentine in San Francisco”). Trip 2 is all about Fort Mason; Trip 3 dips into Baker Beach and Fort Point. Trip 4 was some crazy long bus ride around the city, to McLaren Park, Glen Canyon, Candlestick Hill, etc. The rest of the trips are outside the city in Marin, Angel Island, Hayward.