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Geologic Atlas of Redwood County, Minnesota 72

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Geologic Atlas of Redwood County, Minnesota 72 Prepared and Published with the Support of COUNTY ATLAS SERIES THE REDWOOD COUNTY BOARD OF COMMISSIONERS, ATLAS C-36, PART A MINNESOTA GEOLOGICAL SURVEY THE Minnesota Environment AND Natural RESOURCES Trust FUND Redwood County Harvey Thorleifson, Director as recommended by the Legislative-CitiZen Commission on Minnesota Resources, Plate 4—Quaternary Stratigraphy AND the Minnesota Legacy Amendment'S Clean Water Fund A 273769 Belview Delhi Minnesota River A' 1,100 1,050 Qth A ) A' Qa Qsw RWR-9 1,000 Qtm Qs3 Qg3 Qs3 Qs3 Qs4 QUATERNARY STRATIGRAPHY 950 Qsu Qg4 ! Qws RWR-10 Qws Qws Qw Qws LOCATION DIAGRAM ) Redwood Falls Qsu B' Qu ¤71 Qw ! B )19 900 Amt Qsw ) )19 Qu Amn RWR-2 Qsu Qu Qa Vesta By 850 Amg ! ¤71 Aqm )67 800 Seaforth RWR-8 ) C' Angela S. Gowan (273762) Minnesota Highway 19 Ramsey Creek 273770 Redwood River Redwood Falls Minnesota River C B B' 1,100 Qs Milroy) RWR-3 RWR-4 Morgan D' Qs Qs Qs Qa Qs ) Qs Qs Qa Lucan Wabasso 2016 Qth D ) )68 1,050 Qth Qa Qs Qsw ) RWR-5 Figure 1. Location of 57 cross sections, constructed at Qsd Qtd Qth Qs 68 Qtd Qa Qth Qsw 0.6-mile (1-kilometer) intervals, used to create a three- Qtu ! Qu Qsm ! 1,000 ! Amg Qsm Amg Ku Qtm dimensional model of the Quaternary deposits of Redwood ! Qtd Qsm Qs3 RWR-7 ! ! Qg3 Qs3 Qs4 Qs3 Qg3 ! ! ) County. The locations of cross sections A–A' through 950 Qs4 E' Qu Ku Qg4 Ku Qs3 Qg4 Qs4 Qg4 Qs4 Amt ! Qg4 E F–F' are shown here, and are also shown on Plate 3, Wanda ¤71 900 Ku Qsu Qw Surficial Geology. Black squares depict the locations of Amt Ku ! Qsu ! Amg Qtu Qsu ten Minnesota Geological Survey (RWR-1 to RWR-10) Qsu Ku Qu 850 ! ! rotary-sonic core sites. Qu Amt 800 Qa RWR-6 Amt ) Amg Walnut Grove Revere 750 Lamberton ¤14 F' 700 F )RWR-1 Approximate age present) Marine Isotope Geologic age (years before Speculated Stage (MIS) age West East C C' 1,150 14,000 Heiberg Member Qth U.S. Highway 71 273768 Minnesota Highway 67 Qtn Qs Villard Member Qtv Qtn 1,100 Winnipeg Qtv Qs Qs Provenance Dovray Member Qtd Qtn Qsv Qw Qwt Qth 16,000 1,050 2-4 Qth New Ulm Formation Figure 3. Diagram showing relative age, location (across Qu Qg1 Qs5 Qtv Ku ! ! Qtn Rainy 1,000 Riding Redwood County from west to east), provenance (Fig. 2), and Qg5 Qtu Provenance Amt Mountain Late Wisconsinan Ivanhoe Member Qti Moland Member related unit labels from the cross sections for late Wisconsinan and Agr Qtn Qtm Qtd Qsd Qsu ! Qg1 Provenance Qtm 950 ! Qg3 Qs2 Qs1 pre-late Wisconsinan glacial deposits (Table 1). The age column Amt Qs2 Qg2 Verdi Qs3 Member Qtr ! Qs3 and deposit drawings are not to scale. Marine Isotope Stage (MIS) Ku Qs3 Qs3 29,000 900 Qs3 Qg3 New Ulm Formation correlations were estimated using figures in Jennings and others Amg Qs3 Superior Qs3 ! Rainy lobe (2006). The age shown for the end of deposition for till of the !! Provenance >200,000 850 Qtu ! ! Amt !! Qtu Heiberg Member of the New Ulm Formation is the calendar year p Amg Amg Wadena Mesabi Iron Range gd Qsu Browerville Formation? p ! lobe conversion of a radiocarbon date (12,260 ± 90 yr BP) from wood 800 Qsu Amg ! at the contact between the till and overlying lake sediment from a Amt Brainerd site to the southeast in Blue Earth County (Jennings and others, 750 lobe Good Thunder formation 1 Qg1 Amg 2012). The Browerville Formation has not been recognized in the Superior lobe Good Thunder formation 2 700 Qg2 subsurface in Redwood County and its presence here is used as Good Thunder formation 3 Qg3 a time marker. Studies in Sibley (Lusardi and others, 2012) and Nicollet (Meyer and others, 2012b) Counties placed it between Des Moines lobe Grantsburg D D' sublobe Good Thunder formation 4 1,150 (273763) 273764 (273765) U.S. Highway 71 Minnesota Highway 67 Morgan REDWOOD 6 Qg4 the New Ulm and Good Thunder formations. Two calcite samples COUNTY through from interglacial marl deposits above Browerville Formation Qs Pre-Wisconsinan 18 Good Thunder formation 5 1,100 Qsh Qsh Qs Qg5 till in Todd County in central Minnesota had a uranium series Qtv Qtn Qs Qth minimum age of 200,000 yr BP (Knaeble and Meyer, 2007). All Qw 1,050 Qws Qsv Qtv Qsv Qsn core samples from the area that have undergone detrital remanent Qs1 Qs5 Qg1 Qs5 Qtv Qsu Qtn Qth Elmdale Formation Qte magnetization analysis at the Institute for Rock Magnetism at the ! ! !! Qu 1,000 Qwt Qtu Amt Qg5 University of Minnesota have yielded normal polarity, indicating Ku gd Ku Qg1 Amt Qtu Qtd Qtn Figure 2. Location of major provenances (source regions) and the Pre-Late Wisconsinan they were likely deposited after the Bruhnes normal-Matuyama 950 ! Qs2 Qtm Qsu ! Qg2 distribution of ice-lobe materials at the land surface. Glacial sediments reversed polarity boundary, dated at 780,000 yr BP, and therefore Amt Qg3 deposited in Redwood County derive their distinct material content Qs3 "W" Qw no older than MIS 18 (Lisiecki and Raymo, 2005). Position of 900 Qg3 Amg ! from bedrock and sediment found in the region of these provenances. "V" sequence units as older than 780,000 yr BP is speculative. Amt Qu During the last glaciation, the late Wisconsinan, ice carrying debris of 850 ! predominantly Rainy provenance (brown) covered portions of northeast "W" Qwt >780,000? 800 (Rainy lobe) and central (Wadena and Brainerd lobes) Minnesota and the debris is discontinuously present in the subsurface as far south and 19 or EXPLANATION Amg greater "V" Qv 750 west as the Minnesota River. After Wadena-lobe ice melted, Redwood Riding Mountain provenance Winnipeg provenance County was completely covered by deposits of at least five advances deposits deposits 700 Rainy provenance Period of sediment erosion of the northwestern-source Des Moines lobe (green). "V" Qvt deposits and/or deposition of nonglacial sediment E E' 1,200 Qs Cottonwood River Sleepy Eye Creek U.S. Highway 71 Sleepy Eye Creek 273767 1,150 Qtv Qa Qa Borehole name: RWR-1; unique number: 273761 Borehole name: RWR-2; unique number: 273762 Borehole name: RWR-3; unique number: 273763 Borehole name: RWR-4; unique number: 273764 Qw Qtv Location: T. 108 N., R. 40 W., sec. 1; ABAAB Location: T. 112 N., R. 39 W., sec. 7; DBBCDD Location: T. 111 N., R. 39 W., sec. 16; CCACCA Location: T. 111 N., R. 38 W., sec. 22; BBDBBB 1,100 Qtd Qtv Qa Qa Qs Elevation in feet above mean sea level: 1,451 Elevation in feet above mean sea level: 1,093 Elevation in feet above mean sea level: 1,104 Elevation in feet above mean sea level: 1,086 Qs Qsd Qth Qtd Qth Qs Qs Qs Depth Description Depth Description Depth Unit Description Depth Description 1,050 Qsu Qw Unit Unit Unit Ku Qa (feet) (feet) (feet) (feet) Qtu Qsu Qth 0 0 0 0 Qsu Qsh Olive-brown to black loam till, low amount of gray shale, sandy and pebbly zones Olive-brown to light olive-brown variable sand and silt, esker deposit; Fill 1,000 Qws Qtv Olive-brown becoming very dark grayish-brown loam till, low amount of around 20'; Ivanhoe Member, New Ulm Formation. Heiberg Member, New Ulm Formation. gray shale; Villard Member, New Ulm Formation. Light olive-brown becoming olive-brown loam till, high amount of Qtu Qsu Qw Qtm Qtd Qtn Qsm gray shale; Heiberg Member, New Ulm Formation. ! Qsu 5 Qth 950 Qu Qsu 20 Olive-brown to light olive-brown variable sand and silt with several small till 5 Ku Qsu Qsu layers and inclusions, esker deposit; Heiberg Member, New Ulm Formation. Agr Qtu Qsh 10 ! ! Qsu 900 ! Qu ! Qu Qti 10 ! ! 10 Very dark grayish-brown loam till, low amount of gray shale, a Ku Ku Agr Agr Agr ! 40 few sandy and/or silty seams; Villard Member, New Ulm Qtv Amt Formation. 850 15 15 GIS compilation by J.D. Hamilton Olive-brown loam till, thin sand layer at 20', high amount of gray shale; 20 Edited by Lori Robinson 60 Heiberg Member, New Ulm Formation. Qtv F 20 Qth F' Qsi Black variable sand and gravel with some till layers, outwash; Ivanhoe Member, 1,500 273761 20 Qti New Ulm Formation. Qsh Olive-brown silt/very fine- to medium-grained sand/silt sequence, outwash; Black loam till, low amount of gray shale; Ivanhoe Member, New Ulm Formation. 30 80 25 Qth Heiberg Member, New Ulm Formation. 1,450 Very dark grayish-brown, very fine- to fine-grained sand and silt, local silt and/or Qsh Olive-brown loam till, high amount of gray shale; Heiberg Member, New Ulm 25 Qsv Very dark grayish-brown clayey silt, lacustrine deposits; Villard Member, clay laminations or layers, outwash; Ivanhoe Member, New Ulm Formation. Qsi Formation. Qtv New Ulm Formation. 1,400 30 Olive-brown very fine-grained sand, some silty areas; Heiberg Member, New Very dark grayish-brown loam till, low amount of gray shale; Villard Dark grayish-brown sand, sand with some gravel, and sand and 100 Qth gravel, very fine- to fine-grained sand with silt in bottom 1', Ulm Formation. 30 Qsn Member, New Ulm Formation. Qsi CROSS SECTION SYMBOLS 40 outwash; Villard Member, New Ulm Formation. Qli Dark olive-brown loam till, high amount of gray shale; Heiberg Member, New Very dark grayish-brown clayey silt with some sand, sandier downward, 1,350 Olive-gray silt with some fine-grained sand, laminated light and dark grains, 35 Ulm Formation.
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