The Eroding Sandy Point Esker, Stockton Springs, Maine Eskers are sand and gravel deposits that form inside tunnels within glaciers.
Eskers are usually steep-sided, but often contain multiple ridges.
Maine has many eskers, all of which formed during the last Ice Age, which ended between 14,000 and 11,000 years ago. No study has been performed on the sediment comprising the esker, but many pebbles and cobbles of Mt. Kineo rhyolite are visible on the beaches developed from the esker. The most seaward tip of the esker faces directly into Penobscot Bay and experiences the force of winter storm waves. Despite erosion of the bluff sediment, wave and current action is too strong here to permit much of a protective beach to remain. Thus, the bluff face remains devoid of most vegetation.