Several layers of Berea sandstone are visible near the top of Brandywine Falls, a 60-foot (18-meter) waterfall located in the Cuyahoga Valley National Park, Ohio. Brandywine Falls drops overs over three different types of rock: Berea sandstone at the top, Bedford shale in the middle and Cleveland shale at the bottom. The newest rock is about 320 million years old; the oldest is about 400 million. The layers were exposed and the waterfall was formed about 10,000 years ago when the last glaciers retreated from the area.