Glacial lake Glacial lake A glacial lake is a lake with origins in a melted glacier. They are formed when a glacier erodes the land, and then melts, filling the hole or space that it has created. Near the end of the last glacial period, roughly 10,000 years ago, glaciers began to retreat. A retreating glacier often left behind large deposits of ice in hollows between drumlins or hills. As the ice age ended, these melted to create lakes. This is apparent in the Lake District in Northwestern England where post-glacial sediments are normally between 4 and 6 metres deep. These lakes
Nose Hill Park on top of sandstones and shales that formed the hill's bedrock. During the last ice age, about 15,000 years ago, ice sheets wore away the rock and gravel. At the end of the ice age, retreating ice left glacial till on the hill's top. Glacial Lake Calgary was formed in the area and deposited sediments on the side of the hill. A river, later to be known as the Bow, eroded the sediments and helped shape the south side of the hill. Exposed to the drying and warming effects of the recurrent Chinook winds, Nose Hill provided favorable wintering grounds