At Moraine Lake the cañon proper terminates, although apparently continued by the two lateral moraines of the vanished glacier.

The main lateral moraines that extend from the mouth of the cañon are continued in straggling masses along the walls.

Those at the edge are called lateral moraines, those in the middle, medial moraines, and those at the end, terminal moraines.

Did the ice fields of the Glacial epoch bear heavy surface moraines like the medial and lateral moraines of valley glaciers?