Upper Mill Brook

The impact of glacial activity in this area is apparent: (1) between "H" and "M", a long esker ridge runs north-south - the ridge is the gravel bed of a stream that flowed under the glacial ice cap or in a fissure between sections of ice; (2) the boulder near "J" is a "glacial erratic" deposited as the glacier retreated; (3) Near "L", the large low-lying areas are kettle hole basins - depressions formed when huge blocks of glacial ice buried under sediment melted, causing the over lying ground to collapse; and (4) near "G", small kettle holes abound.