sheer volcanic cliffs near the bear gulch cave entrance, pinnacles national park, california, usa

america american andreas backcountry bear boulders breccia california canyon cave caves central cliffs creek desert entrance environment erosion fault formations fracture gabilan gulch hike hiking landscape line meanders monolith monument moses narrow national natural nature north of open outdoor outdoors park path pinnacles range recreation rim rock rocks rugged san sheer spring states system talus tectonics trail travel tuff united usa volcanic volcanism west western wild wilderness