When the glaciers started to retreat the eskers started depositing their minerals on what has now become land. The glaciers stopped in down town Unity Maine. The uniform deposits are also called eskers. You can follow an esker right out of Unity by driving along Horseback Road. Maine's system of eskers is over 100 miles long and is one of the longest in the country.
Eskers appear as long ridges that stand above the surrounding area.
They are composed of mineral deposits and are used for highways, gravel pits and such. Eskers are formed from glacial deposits. When a glacier is melting, rivers can form inside or underneath the ice. These rivers, like a normal river, carry sediments of all sizes. These sediments may be trapped within the ice of the glacier, or may be eroded from underneath the glacier.