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Batteries to Bluffs Terrain
This photo will give you an idea of the predominant terrain you'll encounter on the trail. The stretches of easy trail are a nice break from climbing stairs on the way back up.
Presidio Geology
Throughout the area, you'll find interesting formations of serpentinite, the California state rock.
Andrew Alden, About.com's Guide to Geology, has a photo tour of Northern California geology that gives a visual overview of the Bay Area's geology -- including a description of the rocks found at Baker Beach.