Glacial potholes, Shelburne Falls. As the name implies, these were formed during plast glacial periods - or more precisely, as glaciers preceded. Glacial Lake Hitchcock drained, the Deerfield River rose, and swiring rocks and sediment carved these cylindrical holes. They range in size from 6 inches to almost 40 feet in diameter.
Glacial potholes during low water conditions. June 7, 2014
To see the full panorama, open this link: http://www.gigapan.com/gigapans/157007
Glacial Potholes, Shelburne Falls - inundated by high water, June 14, 2013. The river was many times larger than this during Tropical Storm Irene.
To see a larger version of this image, open this link: https://www.flickr.com/photos/79718069@N00/20521506443/in/album-72157633607581007/
Deerfield River at Shelburne Falls dam, June 14, 2013. View from the west shore.
Although water was quite high on this day, flows were dramatically higher during Tropical Storm Irene, as can be seen in this video:
https://www.youtube.com/watch?v=p47txwmuwCY.
To see a larger viersion of this June 14, 2013 image, open this link:
https://www.flickr.com/photos/79718069@N00/21150384421/in/album-72157633607581007/