Last Glacial Period River, which in turn was formed during an earlier glacial period. In its retreat, the Wisconsin Episode glaciation left terminal moraines that form Long Island, Block Island, Cape Cod, Nomans Land, Martha's Vineyard, Nantucket, Sable Island, and the Oak Ridges Moraine in south central Ontario, Canada. In Wisconsin itself, it left the Kettle Moraine. The drumlins and eskers formed at its melting edge are landmarks of the Lower Connecticut River Valley. In the Sierra Nevada, there are three named stages of glacial maxima (sometimes incorrectly called ice ages) separated by warmer periods. These glacial maxima are called, from oldest to
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