Apr 2 Glacial Erratics in Connecticut

Glacial erratics are rocks which were moved by glaciers from their origin site to somewhere else. Some have moved hundreds of miles. Certain types of granite from areas of New Hampshire end up as rocks or pebbles found in southern New England are examples of this. I saw many different types of rock on the north shore of Cape Cod. Long Island and Cape Cod were formed by deposits made by the glaciers. As the glacier approached the Atlantic Ocean, the warmer water halted the glacial advance and when it melted, rocks were deposited there.

I've learned that there are competing theories on the rocks left behind. In the photo above, rocks are deposited throughout the forest. This photo was taken on my mother's property near Long Island Sound in Guilford, Connecticut. I had always assumed the terrain looked like this since the glacial retreat but now have learned some are saying when the English came and settled here in the 1600's, the rocks were not above the surface. It was a result of deforestation and agriculture which resulted in erosion of the top soil that revealed the erratics. I'd like to learn more about this before developing an opinion.