OFR10-04, Preliminary Bedrock Geologic Map of Part of the 2007 Ham Lake Fire Area: Portions of Conners Island, Gillis Lake, Long Island Lake, and Munker Island 7.5-minute quads, northeastern Minnesota, and Ontario, Canada
2010
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OFR10-04, Preliminary Bedrock Geologic Map of Part of the 2007 Ham Lake Fire Area: Portions of Conners Island, Gillis Lake, Long Island Lake, and Munker Island 7.5-minute quads, northeastern Minnesota, and Ontario, Canada
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2010
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Minnesota Geological Survey
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Map
Abstract
This map describes bedrock geology along the Gunflint Trail in a part of the area burned during the Ham Lake forest fire in 2007. The map covers only a portion of the fire area because much of the burn lies in Canada, or within plutonic rocks that generally lack significant mappable variations. Only the southeastern corner of the map area was not burned—the burn extends to the north and east beyond the map sheet. The western edge of the map is coincident with the area of the 2006 Cavity Lake fire, which was mapped previously by Jirsa and Starns (2008).
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The geologic contacts depicted on this map are modified from those of Morey and others (1981). Only slight modifications were made for areas of the Duluth Complex and some parts of the basal contact of Animikie group strata. The major revisions from earlier mapping are within the Gunflint Iron Formation, Logan Intrusions, and in parts of the Archean bedrock.
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U.S. Geological Survey National Cooperative Geologic Mapping Program
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Jirsa, M.A.. (2010). OFR10-04, Preliminary Bedrock Geologic Map of Part of the 2007 Ham Lake Fire Area: Portions of Conners Island, Gillis Lake, Long Island Lake, and Munker Island 7.5-minute quads, northeastern Minnesota, and Ontario, Canada. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/98061.
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