The beautiful waterfall at the Basin, has at its base, a granite pothole 20 feet in diameter. It is believed to have been eroded 15,000 years ago while the North American ice sheet was melting. It has been smoothed by small stones and sand whirled around by the Pemigewasset River. Below the Basin is a water-eroded rock formation called the Old Man's foot.
Franconia Notch State Park