Pleistocene Geology of Vilas County, Wisconsin

In Vilas County, WisconSin, up to 85 m of Pleistocene till, debris-flow sediment, and stream sediment overlie Precambrian igneous and metamorphic rock.Most of the Pleistocene sediment was deposited during the last part of the Wisconsin Glaciation when lobes of the Laurentide Ice Sheet advanced into north-central Wisconsin.Three members of the Copper Falls Formation are recognized in the Vilas County area. The Wisconsin Valley lobe advanced into VilasCounty from the north and deposited the reddish-brown, sandy Wildcat Lake Member at nearly the same time the Langlade Lobe advanced from the northeast and deposited the brown, sandy Nashville Member.A number of readvances or periods of ice-margin stabilization occurred as these lobes wasted.The Ontonagon Lobe then