Page 584 - Geosystems An Introduction to Physical Geography 4th Canadian Edition

548 part III The earth–atmosphere interface
▲Figure 17.15 Terminal moraine. a terminal moraine of unsorted till forms isispynten island, part of the Svalbard archipelago in the arctic Ocean; the moraine is separated from the present ice cap by more than a kilometre. [Bobbé Christopherson.]
recent glaciation in North America and Europe (portrayed in Figure 17.25), they left distinct landscapes that we see today. A till plain, also called a ground moraine, is a deposition of till that forms behind a terminal moraine as the glacier retreats and is generally spread widely across the ground sur- face, creating irregular topography but not the characteristic ridges of other moraines. Such plains usually hide the former landscape and are found exten- sively in parts of southern Canada and the U.S. Midwest. Figure 17.16 illus- trates common depositional features associated with the retreat of a conti- nental ice sheet.
▼Figure 17.16 Landforms associated with continental glaciation. [(b) Bobbé Christopherson.]
Glacier in retreat
Till plain Esker
Delta Lake
deposits Kettle lake
Outwash plain
Sand and gravel
(b) Deranged drainage, central Saskatchewan, Canada.
Old lake shorelines
Recessional moraine
Marshes
Kames
Kettle lake
Drumlin field
Deranged drainage region
Meandering stream
Till plain
Terminal moraine
Till
Glacial outwash
(a) Common depositional landforms produced by continental glaciers.
Bedrock