Sandstone-limestone pinnacles are usually formed by rain-water washing down along vertical fractures in the limestone. Pinnacles can be seen in stark formation to the right of a small bay just before the climb to the golf course. Paleontologists Storrs Olson and Helen James of the Smithsonian Institution uncovered bones from two extinct species of a large, flightless goose and an owl here. Bones of other extinct forest birds and flightless rails were also found, dating back to between 3,000–4,000BC.