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
Buried valley glacier itself. Buried valleys are traditionally V- or U-shaped due to the natural shape of valleys, but buried valleys can exhibit different shapes if there were any sort of erosional events after the glacier had finished retreating. The ability to hold groundwater comes from the makeup of the glacial outwash deposits. The glacial outwash deposits of these preexisting valleys mainly consist of coarser materials, such as sand and gravel. Since these materials are coarser, when there is a soil that is almost purely made of these materials, the pore space of the soil increases. This increased pore space creates more