Potomac topographic maps
Click on a map to view its topography, its elevation and its terrain.
Great Falls
United States > Maryland > Montgomery County > Potomac
The rocks of the falls date to the late Precambrian and are about 750 million years old. The rocks are a resistant metamorphized schist, gneisses, metagraywackes, and metaconglomerates. The Falls formed the last time sea level dropped, during the Last Glacial Period about 35,000 years ago, causing the Potomac…
Average elevation: 240 ft