Abstract
The sediment records from 2 kettle lakes were used to compare the magnetic signature of interglacial climate. Pittsburg Basin in southern Illinois recorded Sangamonian climate variations, while Holocene climate variations were studied at Kirchner marsh, Minnesota. Pollen studies from both sites indicate the occurrence of a dry prairie period during both interglacials. Both magnetic records show many similarities in their response to climate change. Glacial sediments are characterized by an abundance of coarse grained magnetic grains, while deciduous forests and oak savanna tend to be characterized by SD and SP grains which occur in very low concentrations. These fine grains are likely to be biogenic. The two prairie periods showed an increase in magnetic concentration, but the grain-size of the magnetic fraction depends on the effects of chemical dissolution and pedogenesis in the catchment and may reflect the evolutionary history of the basin.
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