went to stone mountain, north carolina last week. wikipedia tells me it was formed about 400 million years ago (when fish started developing legs).
“It rises sharply over 600 feet (183 m) above the surrounding terrain. The mountain, which has an elevation of 2,305 feet (706 m) above sea level, is known for its barren sides and distinctive brown-gray color, and can be seen for miles. The mountain offers some of the best rock climbing in North Carolina, and the park’s creeks and streams feature excellent brook trout fishing.
Because the mountain is the best example of a monadnock in massive granite in North Carolina it was designated a National Natural Landmark in May 1974″
here’s nacholden up there on the light side of the moon.