Glacial potholes located in Shelburne Falls, MA blank greeting or note card. Truly a spectacular geological wonder. Formed when the last glaciers melted when stones trapped in cracks in the riverbed were twirled and vibrated in the fast moving current, drilling their way into the river bottom. I've left the card blank so you can add your own personalized greeting and message with the design tool, or leave it blank - the choice is yours - it's easy and fun!