SA Bedrock Geologic Map 2017
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Prepared and Published with the Support of OPEN FILE REPORT MINNESOTA GEOLOGICAL SURVEY THE U.S. GEOLOGICAL SURVEY NATIONAL COOPERATIVE GEOLOGY MAPPING PROGRAM UNDER AWARD NUMBER G16AC00192, THE BEDROCK GEOLOGIC MAP OF THE SOUTHERN ARROWHEAD AREA, LAKE OFR-2016-04 Harvey Thorleifson, Director ST. LOUIS AND LAKE COUNTY BOARDS OF COMMISSIONERS, AND THE MINNESOTA ENVIRONMENT AND NATURAL RESOURCES TRUST FUND AS RECOMMENDED BY THE LEGISLATIVE-CITIZEN COMMISSION ON MINNESOTA RESOURCES AND ST. LOUIS COUNTIES, NORTHEASTERN MINNESOTA By Terrence J. Boerboom, Amy L. Radakovich, Mark A. Jirsa, and Val W. Chandler Minnesota Geological Survey University of Minnesota 2017 90°57’52” Mrf Mnu Mrf Mnr Mnr 47°30’00” Mjm Mnb Mbc Mrc Mnr Mjm MmdMmg Mjx Mbc Mmg Mmg Mrf Mrc Mmm Mjm MroMnr Mro Mnu Mce Mjm Mrf Mnr Max Mcd Mca Mjx Mri Mri Mce Mmm Mmg Mjd Mrc 93°07’30” Mca Mmg Mbf Mrf MriMra Mgf Mjt Mmi Mbq MbfMro MAP UNITS Mwm Mgg Mca Mjt Mnr Mrc Mny Cook S Ams Aqp Pab Pvt Mgg Mcb Mmg Mjl Mbi MroMro T58 R5 S Aqp Mri S Mbi Mri S S Mmg S ! Avc F Aqm M M S PabF Pab Ams Mjg Mbp F M Pab Aqp Paq Mpt Max Mjg Mbi Mbc Mbi Mro Mrf Mnl 47°30’00” F Avc Mvh Mgt Mjl Mbp Mra Paq PaqPaq Ams Ams Mvh Mce Mca Mbq Mro MbqMbcMbcMbi Aqm Aat F F Pab! ! Ams Pab Mmg Mjl Mju Mjh Mjx Mfl Mdh Mto M F Pab M Pab Ams Gilbert Mui Skibo Mgf Mjx Mbp MbqMroMbq Chisholm M ! Avc Ams Mvh Mgg Mjx Mjx Pvt Mpt Mju Mju Mro T58Mnr R6Mny ! Pvt Pab Amg !Paq Mvh ! Mcd Mja MjaMja MnbMbi Mro Mro F Avc T58 R7 Mbg Mbo Mny Pab T58 R19 Pvt Max T58 R8 Mjf MjfMjh Mjx Mbi Aqm Pab Pab Amm Paq Mju Mja Mjf Mri Mbi Mny Mnu Msf Mdj Mtg Aat Paq Pab Pab Ams Mgt T58 R9 Mbf Mbf Mnl Mnl LargoPab Ams Amm Pab Max Mvh T58 R10 Mjf MjxMjx Mbi Mrf Mbo M Amg T58 R11 Mjl Mfq Mjh Mro ! Ams AmgAmm Mvh Max T58 R12 Mfq Mjx Mri Mnm Ams Max Mvh T58 R13 Mwg Mfq Mbc Mny S T58 R14 Mca Mju Mbo M Pab Amg S Pab Mvh Mfq Mja Mrf F Paq M T58 R15 Mcb Mja Mbp Paq F F T58 R16 Max Mvh Mny Msl Mdk Myg M Mvh Mro Mbc Aat Paq AmsM Paq Max Mnr Mjf Mbg Mbp Mbq Pab M Maple T58 R22 T58 R21 Lavinia M Pvt Mwm Mbf Mro Mbf MnfMnk Aat M Ams Amm Mbg Saint Clair Junction M Ams Mvh Mfq Mbf Mbi ! Pab T58 R17 Mfq Mbp ! Mbg F Paq Amg Mbg ! Max Mce Mcf Mfq MbpMbg Mnb Mbq Pab AmmAmg Pab! Mjl Mbf Mbg Mnb Paq Pab Pab Genoa Mgg Mfg Mbq Mbc Msk Mdt Myd Paq Mju Mbq Mnc ! Max Mdd Mbp Mbi MbcMbi Pvt M Paq Mui Mpt Mjl Mfg Mfg Mbi Mnm Pab F ! Whyte Pab F Pab T58 R20 T58 R18 ! Mgf Mnr Mbp Mnb Mbf Mbi Mbi Mbo Mnl ! Pab Mvh ! Mcd Mfg Mbf MbgMbf Mnk Paq M Mvh Mgt Mca Mju Mjh Msm Mdx Msy F Msh Mce Mfq Mro Mra Pab M Mca Mcb Mfq MbpMbg Mbg Mbg ! Pab Mce Mfg MbiMbf Mnk Paq Pab Mvh Mvh Mfq Mra Mra Mbp Mbo Wolf Snowden Mxg Mbp Mbp Paq ! ! Scott! Mwm Mra Mbp Pab Mahoning M Max Pab Pab ! Mnb Mrf Mdb Msa Paq ! ! ! Mfg Mfg Mfg Mra Mra Mnu Mnk Paq S Mvh Mnb Mnb Mro Mnl Pab F Mxg Mnr Mcg Mnb MroMro S Pab ! Pab Pab Mjl Mnb Mro M Pab Pab Pab ! Mnb Mfg Mnx Mra T57Mnb R6 Mnm Clappers Msh Mcf Mih Mju Mfg Mnb Mro Mra Mnk Mrc Mdn Msc Pab ! ! Mgg Mcf Mce Mxg MnbMra Pab ! Mnb MnbMra Mra Paq Sherwood Mda Mwg Mro Mxq Mra Mnb Pab! Mcg Mfg Mfg Mra Mnc Pab ! Mgf Mvh Mcf Mxq Mnl Mih McgMcg Mfq Finland Mnb Mnf Mri Mma Mom Max Mnb Mih MceMce Mce Mcb Mnb Hibbing Mgt Mjl Mfg Mro LittleMni MaraisMnb Mnl ! ! ! Mcg Mjl Mju ! Mnb Mnb Paq ! Mgg Mdd Mnb ! ! Reno Mgt T57 R11 Mvh Mju Mnb M Max Mxg Mnb Mro Mmt Moo Pab ! ! Mda Mca Mjl T57 R8 MnbMra Mro Palo Mcg Mju Mcb Mro Mna Mro Mvd ! Scott Junction Mfg Mro Paq Kirk T57 R7Mna Mro Mvd Mnc Pab ! Ramshaw ! ! Mcb Mfq MxgMro Mvd Mra Mro ! ! Mpt T57 R13 Mfg Map Symbols Mra Mgn Mog Paq T57 R14 Mvh Mxg Mnb AatPaq Pab T57 R16 T57 R12 Mfg Mro Mro Mjl Mnb Mnb Mnb Mnl T57 R19 Mcd Mju Mfq Mxg Mca Mna ! Mda Toimi Mxg Mxg MnbMnbMnb T57 R22Pab T57 R20 Mce Mxg Mxg MnrMnb Bell Harbor Mnb T57 R15 ! T57 R10 T57 R9 MxgMxg Mny Mnb Mrg Mgf Mof Pvt T57 R17 Mgf Mfg Mxg Mnx MnyMnb Cherry Mgg Mxg Mxg Mna Mnx Mna Mro Mnb! Mcg Mxg Mvd Mro Contacts and faults Keewatin ! Mxg Mnb Mnb Pab ! Mgt Mxg Mno MnbMfh Mui Mxg Mnb Mvd Mgg Mwm MxqKennedyMro LandingMca Mnb Mnb Mnb Mnb Mnl Mop Mda Mfg Mnb Mnb Pab Mui Mdd Mca Mfq Mxg Mxq Mnb Mnb ! Mxq Mnb Mvd MnxMnb Geologic contact T57 R18 Mxg Mro Mra Mra MnbMnbMnx Mpf Mgt T57 R21 Mxq Mxq Mna Mhq Keenan Max Jordan Mxq Mra Mro Mnb ! Mra Mnb Msm ! Mvd Mnb Mnb Mnb Mnb MroMroMro Mnb Outline of Cretaceous rocks Mxg Mnb Mro Mno Mro Mjh Mpc Mho Mxg Mxo Mro Fairbanks Mxg MraMra MsmMnb Mnr Mgn Mnu Mvd Mro Msl Mvh Mnb Mro Peary !Mda ! Mcb Mxo Mra Mro Msm MnbMroMnoMnb Mda Mmi Mjn Mra Mpf Msm Fault ! ! Mra Mno MnbMnoMro Mvh Mxq Mro Mxo MraMra MnoMsfMny Mns Mjf Mbb Mhg Mpt Darby Junction Mpf Mno Mih Mih Mxo Mxo Mnu Mvd Mro Mnb Mnb Mnb Mnb Mmt ! Mxo Mra Mno 5 5 5 Riley Mra Mro MnrMny Mro Mnb Mma Mxo IllgenMvd CityMnb Mnb Msm ! MvhMvh Lax Lake MnoMnb MnbMno Fault, reversed Mja Mbt Mht Forbes Makinen Mxg Mxo Mnu Mra Mno Mny! Mra Mro ! Mih Mxg Mny Msm Mcd ! Mra Mra Mra Msm Mnb Mnb Max MraMraMra Msl Mro MnbMny Mcf Mxg Mnu Mra Mny Mnu Mjx Mwm Mkf Mmt Mkf Mxg MraMra Mra Mny MnrMnbMno Hornby Mih Mxo Mnu MraMroMnb Mny Mro Mnr Dikes ! Mxo Mro T56 R10 T56Msl R7 Mnu Mnb Mnb Mnb Mjg Mkg MraMsm Mro Mpt Mkg Mro Mno Mro Mra Msm Mnu Mny Mnb Md Mwm Mny T56 R19 Mma Mnu MnbMno Mro T56 R12 T56 R8 Mnu Mju Mda Msr Mgn T56 R9 Mro Mro MnbMny Mnu Mro Mro Max Mfb T56 R11 Mra Mno Msm Mny Med McNair Mro Mnu Msm Mro T56 R13 Mvh Mcd Msf Mro T56 R14 ! Mxo Mnb Mjt Max Msb T56 R15 Mcb Mxo Mra Mra Msm T56 R18 T56 R17 T56 R16 Mmt Mro MsmMsf Mcd Mro T56 R22 T56 R21 T56 R20 Mvh Mra Msf Msl Onega Msm Mft Breda Mca Mvd Mvd Msm ! Mkg Mpf Mro Mjd Mde Mdd ! Mfb Mra MnbMnb Lake Mra Mnb Mnr Mcc Mra Mnb Mno Mno Zim Silver BayMno Mno Mn Mjm Mdp Mnl Mro Mnb ! Mno Mno Mnp Mra ! Mma Mvh Mrg Markham Mnp Mnp Mnb Mwm Mfb Mnb ! Mvh Mca MnoMnp Mno Mnb Mjl Mfb Mnm Mkf Mvh Msc Mno Mra Mr Max Mno MnoMnp Mro ! Mnb Mro Mno Mnb Mro Msk Mvh Mnr Msk Msl Mra Mjn Mwg Mnk Mxo Msy Mno Mro Mu Mnu Mxo Mxo T55Msm R7 Mwm Mnb Mro Mxo Mnb MnrMnb Msk Brimson Msc Msm Mfg Mfd Mnf Max Mfb Mud Mnb Mnb ! Mnb Mnb Mny Mxo Mxo !Mno Mnr Pdn Mvh Mnb MnyMnb Mkf Mxo Mro Mnr Mfq Mui Mnc Mkf Beaver BayMnb Msk MraMra Mnr Mvh Msc Mno ! Mrg T55 R8Mro Mra ! Silica Mof Folds Mcg Mdg Mna ! Rollins Mro 5 5 Mog Mro Msm 5 5 ! Msc Mxg Mno Casco Mbb Mkg Msl F Mwm Anticline ! Mbb Mbb Mro Mcf Mdo 5 5 Mnb 5 5 Mbt Msk Beaver Crossing Mra Itasca Mrh Mom Mnu Mnp 5 5 5 5 ! Mnp Melrude Mbt Mom Mxg Mra S Mce Mih Mnd Mnp Mnp Monocline ! T55 R10 Mof Mno Mnu 5 5 5 5 Mbb Mog T55 R12 Wales Mnu T55 R14 T55 R13Max Mag! T55 R9 Mno Mnp Mro 5 T55 R15 5 Mcd Mmi Mni 5 5 M T55 R17 Mbt MraMnu Mro T55 R18 Mbb Mna Mnu Syncline T55 R22 T55 R21 T55 R20 T55 R19 T55 R16 Mbt MnoMnu 5 5 Max Moo 5 5 Mpc Mih T55 R11 Mcc Mzf Mno 5 5 Mbt Msc 5 5 5 MrgMra 5 5 MuiMui Mpc Mht Mom Mna Msb Linear Features Mrg Mrg Mih Mvh Mrh Mna Mrg Mcb Mpg Mnp 5 5 5 5 Mvh Mra 5 Mna Mvh Mno Mvh Mnb MraMraMnb Mrg Flow contact Mvh Mvh MnoMvd 5 5 5 Sax 5 5 Highland London Mno Mra Mro Mca Mgd Mnr ! ! ! Mna Mnb 5 5 Msr Mna 5 5 Max Mop MnaMna 5 Mui Mvh Mno Mui Mna Mnb Msm Lidar foliation Max 5 5 Mno MsfMnb Mxq Mag Max Mra Mns 5 5 5 Mna Mvd Aqm MuiMui Msa Msb 5 Hull 5 Mom Mna Mna Max Mso Mno MsbMnbT54 R8Mra 5 ! 5 Mna 5 Lidar fracture Mxg Mbx Mnu Max Mvh Mom Mna Mna 5 5 Lauren Mbb Msr Mnb Mno 5 5 ! Whiteface 5 Mna Mno Mna 5 ! 5 Mxo Mrh Mny Mop Mna Msr Thin interflow sandstone 5 5 5 Max Mht Mpg Mna 5 5 Mbb Mvh Mnu Mna 5 Mna Mbg Mfh 5 Mnx Mwm Outcrop 5 5 Mnb 5 Cotton 5 Mzf Mof Mno ! T54 R10 Msa 5 5 Mbq Mud Mvh 5 Toivola 5 ! T54 R9 Msy 5 5 Mno 5 5 Max Mbt Mbc Meg Msh 5 5 Mvh T54 R11 Msc 5 Kelsey 5 T54 R12 Alger ! T54 R13 Msg ! T54 R15 T54 R14 Mna Mbf Mes 5 T54 R16 5 Meb 5 Dumblane 5 Mnu T54 R22 T54 R21 T54 R20 T54 R19 ! Mnp 5 Msy 5 T54 R17 5 Mbi Mls Meo 5 Mwm5 5 5 Mno Mno T54 R18 York Mhg St.