"Mount Desert Island was host to the Laurentide Ice Sheet as it extended and receded during the Pleistocene epoch. The glacier left a number of visible marks upon the landscape, such as Bubble Rock, a glacial erratic carried 19 miles by the ice sheet from a Lucerne granite outcrop and deposited precariously on the side of South Bubble Mountain in Acadia National Park. Other such examples are the moraines deposited at the southern ends of many of the glacier-carved valleys on the Island such as the Jordan Pond valley, indicating the extent of the glacier; and the beach sediments located in a regressional sequence beneath and around Jordan Pond, indicating the rebound of the continent after the glacier's recession approximately 25,000 years ago." - Gilman, R.A., Chapman, C.A., Lowell, T.V., and Borns, H.W., 1988, "Shaping of the Landscape by Glacial Erosion, in The geology of Mount Desert Island: Augusta, Maine Geological Survey Bulletin 38."
