Because the sediment of these hills
was deposited into a preglacial lake they are stratified and classified as a“Kame delta.”.
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Because the sediment of these hills
was deposited into a proglacial lake, they are stratified and classified as a"Kame delta.
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A brief retreat and readvance of the ice sheet onto the
delta deposited unstratified material there, creating a rare hybrid structure called"Kame moraine.