Figure 6. Front (southeast) side of Palmer Hill Delta, near north edge of the Wiscasset quadrangle. Maine's sandy deltas are extensively used for growing blueberries, whose leaves turn brilliant red in the fall. Springs are common on the frontal "toe" of these deltas, including the forested area seen here. They occur where ground water flows down through the permeable sand and gravel and then hits a low-permeability material such as marine clay and flows laterally out to the delta front.
Last updated on January 5, 2011