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
Glacial series to the margin of the ice sheet, mostly in a northwesterly direction. Meltwater valleys are a special landform in Northern Central Europe. Like all models, the model of the glacial series gives only a simplified picture of the real situation. In particular, it is often forgotten that the landforms of the glacial series were formed almost at the same time alongside one another, whilst the ice margin remained static by the terminal moraine. Furthermore the ice then had to advance as far as the later terminal moraines and then melt away again. The processes that accompany that, clearly alter the