Answers Credits Description Gilbert Lake marks the drainage divide between the Parrsboro River and the River Hebert. The boundary is a moraine which is a feature of glaciated regions. Moraines are formed when the ice front does nor advance but ice continued to flow bringing all of the ice bound mud, sand and gravel to the front. In this case think of the glacier as being a conveyer belt.
Material piles up at the front forming the moraine.
Interpretation Surficial geologists interpret the Gilbert Lake Moraine to as an end moraine formed during a readvance of an ice cap north of Parrsboro. The formation of the moraine cut off the water supply for the outwash plain and delta at Parrsboro. The readvance also deposited a stoney till sheet called the Shulie Lake Till that terminates abruptly against the moraine.