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intro to dunes

Heather Hall

on 22 October 2013

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Transcript of dunes

Indiana Dunes
Glacial History
Northern hemisphere has been repeatedly covered by ice sheets
-the last was the Wisconsin ice sheet
-it extended from the east coast to the Rocky Mountains
-has done much to give us our present day landforms and drainage patterns
Glaciers Carve Land
The Wisconsin glacier moved debris that was deposited in landforms known as moraines.
Moraine is defined as an area in which sediment has been deposited by glaciers.
The Valparaiso Moraine is a large one of these which extends across the region.
...into rivers...
melting ice drains...
Rivers carried melt matter and silt. This was deposited into river beds. This can still be found in the beds of the Wabash and Tippecanoe. The Kankakee River became a major drainage route for the melt.
Ancient Lake Changes
There were 3 stages in which the lake levels dropped. The Valparaiso Moraine created a U-shaped disk around the lake. The shores of the ancient lake that shrank over time make up...
...the dunes!
Full transcript