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Browsing Open-File Reports by Subject "Bedrock"
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Item 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(Minnesota Geological Survey, 2010) Jirsa, M.A.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).Item OFR10-05, Preliminary Bedrock Geologic Map of the Grand Marais 7.5' quadrangle, Cook County, Minnesota(Minnesota Geological Survey, 2010) Boerboom, T.J.; Green, J.C.Bedrock geologic map of Grand Marais 7.5' quadrangleItem OFR13-01, Preliminary Bedrock Geologic Map of the Pagami Creek Fire Area, Lake and Cook Counties, Northeastern Minnesota(2013) Jirsa, M.A.; Leu, A.; Miller, J.D., Jr.This geologic map encloses the area burned by the 2011 Pagami Creek forest fire—one of the largest in Minnesota history. It covers all or parts of fifteen 7.5-minute quadrangles, and lies within parts of the Superior National Forest and Boundary Waters Canoe Area Wilderness. The map area contains bedrock units spanning a wide range of ages from Archean to Mesoproterozoic, and a generally thin and discontinuous cover of glacial sediment. The majority of the map portrays intrusive units of the Mesoproterozoic Duluth Complex, including portions of the anorthositic and layered series’. Although the map primarily depicts bedrock geology, some features of glacial origin are also portrayed. The map is considered preliminary largely because geologic mapping in the area by a number of authors is ongoing—a final version is likely to be published in coming years.