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Lake Winnipeg r Popla 98° R 4 W R 3 W R 2 W R 1 W R 1 E R 2 E R 3 E R 4 E R R 5 E R 6 E R 7 E R 8 E R 9 E R 10 E 96° R 11 E iv 575 000 600 000 N62o5r 0t0h0 er 650 000 675 000 700 000 53° 53° 0 SURFICIAL GEOLOGY COMPILATION MAP SERIES ! 0 0 Poplarville ek e 5 Poplar River ! r Mukut7 awa C 8 N The Surficial Geology Compilation Map Series (SGCMS) addresses an increasing demand for o 5 r th Tp 46 consistent surficial geology information for applications such as groundwater protection, P Tp 46 o Poplar Point p industrial mineral management, protected lands, basic research, mineral exploration, la r R engineering, and environmental assessment. The SGCMS will provide province-wide coverage iv e r at scales of 1:500 000, 1:250 000 and a final compilation at 1:1 000 000. r e The unit polygons were digitized from paper maps originally published by the Geological v a Survey of Canada and Manitoba Geological Survey (MGS). In several areas, digital polygons e P W derived from soils mapping were used to fill gaps in the geological mapping. The 1:250 000 o pl scale maps provide a bibliography for the original geological mapping. ar Tp 45 Tp 45 Edge-matching of adjoining 1:250 000 scale map sheets is based on data from the Shuttle Radar Topography Mission Digital Elevation Model (SRTM DEM1) as interpreted by the MGS. Gilchrist Other polygon inconsistencies were modified in a similar manner. Geology (colour) is draped M over a shaded topographic relief map (grey tones) derived from the SRTM DEM. arc ha k nd ree R C Lake iv e 1 r United States Geological Survey 2002: Shuttle radar topography mission, digital elevation model, Manitoba; United Cree k States Geological Survey, URL <ftp://edcsgs9.cr.usgs.gov/pub/data/srtm/>, portions of files N48W88W.hgt.zip through N60W102.hgt.zip, 1.5 Mb (variable), 90 m cell, zipped hgt format [Mar 2003]. 0 0 0 Tp 44 Tp 44 0 LEGEND 5 t 8 s 5 i r h Quaternary c Many Bays il G 0 0 0 0 ORGANIC DEPOSITS: peat, muck; <1–5 m thick; very low 5 8 Weaver 5 Lake O relief wetland deposits; accumulated in fen, bog, swamp, and River marsh settings Lake k jac key McPhail his ke SHORELINE SEDIMENTS: sand and gravel; 1–2 m thick; W La Lm Tp 43 beaches; formed by waves at the margins of modern lakes Tp 43 P o p la r LAKE COLLUVIUM: landslide debris, eroded slopes, sheet flood Bull C deposits associated with steep slopes R ive Lake r Harrop EOLIAN: sand and minor silt; dunes, blowouts and undulating Leaf Wrong Harrop E plains; generally overlies deltaic sediments, coarse lacustrine Lake sediments, or glaciofluvial deposits Tp 42 Lake Tp 42 Mossy Point Lake Head Leaf ALLUVIAL SEDIMENTS: sand and gravel, sand, silt, clay, R A iv organic detritus; 1–20 m thick; channel and overbank Leaf e r sediments; reworked by existing rivers and deposited primarily 0 as bars 0 Lake 0 r ive 5 R 2 8 MARGINAL GLACIOLACUSTRINE SEDIMENTS: sand and 5 Ls gravel; 1–20 m thick; beach ridges, spits, bars, littoral sand and 0 gravel; formed by waves at the margin of glacial Lake Agassiz 0 Eardley 0 Tp 41 5 Tp 41 Reef 2 8 5 Lake OFFSHORE GLACIOLACUSTRINE SEDIMENTS: clay, silt, minor L Lc sand; 1–20 m thick; very low relief massive and laminated deposits; deposited from suspension in offshore, deep water of glacial Lake Agassiz; commonly scoured and homogenized by icebergs Reindeer DISTAL GLACIOFLUVIAL SEDIMENTS: fine sand, minor gravel, Gs thin silt and clay interbeds; 1–75 m thick; subaqueous outwash fans; mi deposited in glacial Lake Agassiz by meltwater turbidity currents; Reindeer WINNIPEG Etoma Tp 40 Tp 40 commonly reshaped by wave erosion and reworked by wind PROXIMAL GLACIOFLUVIAL SEDIMENTS: sand and gravel; G 1–20 m thick; complex deposits, belts with single or multiple esker ridges and kames, as well as thin, low-relief deposits; deposited in R contact with glacial ice by meltwater iv e r h rt o r Pakwa TILL: diamicton; 1–75 m thick; low-relief, commonly streamlined deposits; subglacial N Rive Island Berens River Tp 39 deposits; largely derived from shale above the Manitoba Escarpment, carbonate rocks Tp 39 ! L 0 in the central lowlands, and crystalline rocks in areas of Precambrian terrane; 0 0 Is i R 0 land tomam i thicker sequences consist of multiple units of varying texture; commonly scoured by icebergs; 0 E ve 8 r 5 Etomami covered discontinuously by thin veneers (<1 m) of glaciolacustrine and glaciofluvial sediments Berens 0 0 0 0 0 8 5 Calcareous clay diamicton, predominantly derived from Mesozoic Island Tm shale Pawn B Tp 38 Tp 38 Big Sturgeon ere ns L Calcareous silt diamicton, predominantly derived from Paleozoic Tc Island dolomite and limestone Pigeon Non-calcareous sand diamicton, predominantly derived from Tp Pre-cambrian crystalline rock Point Long L Pre-Quaternary Tp 37 Commissioner Tp 37 ROCK: > 75% bedrock outcrop; Cretaceous shales above the R Manitoba Escarpment, Paleozoic carbonate-dominated rocks in Island areas west and south of Lake Winnipeg, exposed typically as P River ig eo glacially striated, low-relief surfaces; in Precambrian terrane, generally n unweathered intrusive, metasedimentary, and metavolcanic rocks 0 McBeth 0 W 0 having a glacially scoured irregular surface with high local relief h 5 i 7 te 7 Clarks 5 Point Uncoloured legend blocks indicate units that do not appear on this map. Tp 36 Tp 36 0 To aid the reader a shadow effect has been added to exaggerate the topographic relief. 0 Point 0 5 7 7 5 Published by: Manitoba Industry, Economic Development and Mines Manitoba Geological Survey, 2004 R i B ve e r a v Compiled by: G.L.D. Matile and G.R. Keller e r Kinwow Modified from: Round Tp 35 Tp 35 Stanton, M.P. Clarke, M.D. 1988. Surficial geology, Berens River, Manitoba; Geological Survey Sturgeon L R iv Bay e of Canada, "A" Series Map, Map 1685A, Scale 1:250 000. Bay r 52° 52° 575 000 Kinwow 600 000 625 000 650 000 675 000 700 000 98° 96° R 4 W R 3 W R 2 W R 1 W R 1 E R 2 E R 3 E R 4 E R 5 E R 6 E R 7 E R 8 E R 9 E R 10 E P ig Scale 1:250 000 eo n 0 10 20 30 R i ve Kilometres r A brief description of the Quaternary landscape of southern Manitoba Major landforms: southern Manitoba Major landforms: NTS 63A 100° 98° 96° 98° 96° G 53° Eastward-facing bedrock escarpments culminating in cuestas which form the Manitoba Escarpment provide a foundation for the 53° e 53° 53° The Pas Moraine or M ge NTS 63A G present-day landscape of southern Manitoba. To the east, the landscape is dominated by Precambrian rocks and bedrock structure, o Is SURFICIAL GEOLOGY COMPILATION MAP SERIES ra l e i an o ne d r such as faulting, is commonly visible. ge I sl Dead-ice an SG-63A topography d Above the Manitoba Escarpment, the landscape is dominated by hummocky moraine or dead-ice topography, streamlined M Streamlined landforms o topography and glacial spillways. Many areas are covered by thick sequences of glacial till representing numerous glacial episodes ra in Precambrian e dating back more than 100,000 years. The most recent glacial advances were from the northwest. Glacial till tends to be clay rich. shield 52° The Interlake is dominated by streamlined landforms and in lower areas, glaciolacustrine depositional basins. Quaternary sediments 52° Surficial geology of the Berens River map sheet tend to be relatively thin and the preservation of older sediments is uncommon, limited to bedrock protected areas such as Dead-ice B e escarpments. Bedrock outcrops are common. Glacial advance was generally from the northwest, parallel to the streamlined topography d (NTS 63A), Manitoba r o c landforms. Glacial till is typically silt rich. Glacial retreat occurred in a series of steps marked by moraines: the Darlingford Moraine k Precambrian f a u l shield 100° 96° 92° 88° (~11,000 years old); the Sandilands Moraine, which represents the interlobate position of the Rainy lobe from the northeast and the ts Red River lobe from the northwest; the Birds Hill–Belair Moraine; the Teulon Moraine; and The Pas Moraine (~9000 years old). 60° U p 51° Index Map George Island Moraine, contemporaneous with and to the east of The Pas Moraine, is another ice margin of the retreating Rainy 51° pe 64N 64O 64P 54M r Precambrian Ca G A m l ac shield lobe. s p ia s b l f e e i lu n l l te n 54L 54K Dead-ice i 64K 64J 64I 58° i w s b a topography a r In the Precambrian shield, rock outcrops dominate the landscape. Quaternary sediments are commonly thick, but discontinuous, o v o i l 58° n e im e - M e c i rarely completely infilling the bedrock lows. Older sediments, including saprolites, are often preserved in the bedrock lows where n r t u i 54F s i o 64F 64G 64H 54E t a p a f 54G r l i s o c l e a they are protected from glacial erosion.
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