Eons ago, the Wisconsin River carved a path through the ancient sandstone and left a picturesque gorge with many beautiful rock ledges where Wisconsin’s Rocky Arbor State Park is now located … just a short distance from the hustle and bustle of Wisconsin Dells. The river changed course over time and is now located about a mile and a half away. The ledges, aged at about 500 million years, were created when rivers drained into shallow seas and deposited sand grains that compacted into sandstone when the seas retreated. Many trees are somehow now growing out of, and on top of, the sandstone.