Follow Route 191 north from East Machias. Drive by—no specific stop, view from roadway.
N 44°49’03” W 67°25’05”
The Jacksonville Esker: This is a long ridge of sand and gravel formed in a tunnel at the base of the glacier. Route 191 follows this esker ridge for several miles. The broad, flat-topped areas are deltas built from the tunnel mouth and draped on the esker during pauses in the retreat of the glacier margin. These deltas were built to a relative sea level approximately 245 feet above the present one.