e in R 18 W R 17 W R 16 W R 15 W R 14 W R 13 W R 12 W R 11 W R 10 W R 9 W R 8 W R 7 W R 6 W R 5 Wo 100° ib 98° 450 000 475 000 500 000 525 000 550 000 in s s A 50° 50° SURFICIAL GEOLOGY COMPILATION MAP SERIES Ingelow Justice Harte Gregg Firdale The Surficial Geology Compilation Map Series (SGCMS) addresses an increasing demand for 5 Portage la Prairie Forrest Bagot 1 consistent surficial geology information for applications such as groundwater protection, MacGregor 10 industrial mineral management, protected lands, basic research, mineral exploration, 1 Austin engineering, and environmental assessment. The SGCMS will provide province-wide coverage 1 at scales of 1:500 000, 1:250 000 and a final compilation at 1:1 000 000. Dakota Tipi Tp 11 Tp 11 Newton The unit polygons were digitized from paper maps originally published by the Geological Southport Oakville Survey of Canada and Manitoba Geological Survey (MGS). In several areas, digital polygons derived from soils mapping were used to fill gaps in the geological mapping. The 1:250 000 13 scale maps provide a bibliography for the original geological mapping. 1 Sidney Douglas 1 Edwin 1 Edge-matching of adjoining 1:250 000 scale map sheets is based on data from the Shuttle
0 0 1 0 0
0 0 Radar Topography Mission Digital Elevation Model (SRTM DEM ) as interpreted by the MGS.
5 5 2 2
5 Chater Carberry 5 Other polygon inconsistencies were modified in a similar manner. Geology (colour) is draped 34 5 5 over a shaded topographic relief map (grey tones) derived from the SRTM DEM. Brandon Cottonwoods Tp 10 1 Long Plain Tp 10 1 United States Geological Survey 2002: Shuttle radar topography mission, digital elevation model, Manitoba; United A States Geological Survey, URL
0 0 EOLIAN: sand and minor silt; dunes, blowouts and undulating
0 Rathwell 2 0 5 5
5 5 E Treesbank plains; generally overlies deltaic sediments, coarse lacustrine Treherne sediments, or glaciofluvial deposits 2 Carroll ALLUVIAL SEDIMENTS: sand and gravel, sand, silt, clay, Nesbitt A Wawanesa Holland organic detritus; 1–20 m thick; channel and overbank Stockton 34 sediments; reworked by existing rivers and deposited primarily 10 as bars Tp 7 R Tp 7 2 iv e r MARGINAL GLACIOLACUSTRINE SEDIMENTS: sand and 2 Glenboro Cypress River Ls gravel; 1–20 m thick; beach ridges, spits, bars, littoral sand and gravel; formed by waves at the margin of glacial Lake Agassiz r ive R Notre Dame de Lourdes OFFSHORE GLACIOLACUSTRINE SEDIMENTS: clay, silt, minor Graysville Lc sand; 1–20 m thick; very low relief massive and laminated deposits; Hilton 5 Roseisle deposited from suspension in offshore, deep water of glacial Lake Cardinal Carman Agassiz; commonly scoured and homogenized by icebergs Tp 6 Tp 6 Bruxelles r e ris iv Sou C R DISTAL GLACIOFLUVIAL SEDIMENTS: fine sand, minor gravel, yp re Gs thin silt and clay interbeds; 1–75 m thick; subaqueous outwash fans; ss deposited in glacial Lake Agassiz by meltwater turbidity currents; commonly reshaped by wave erosion and reworked by wind 18
0 St. Alphonse 0
0 Bone 0 0 0 L PROXIMAL GLACIOFLUVIAL SEDIMENTS: sand and gravel; 5 5 7 7 4 4 G 1–20 m thick; complex deposits, belts with single or multiple esker 5 Swan Lake Somerset 5 Margaret Dunrea Belmont ridges and kames, as well as thin, low-relief deposits; deposited in Ninette Tp 5 Tp 5 23 Altamont contact with glacial ice by meltwater 23 23 Baldur Swan Lake Reserve
Miami Rosebank TILL: diamicton; 1–75 m thick; low-relief, commonly streamlined deposits; subglacial P 23 e Greenway 23 St. Leon deposits; largely derived from shale above the Manitoba Escarpment, carbonate rocks l Mariapolis ic a Lake in the central lowlands, and crystalline rocks in areas of Precambrian terrane; n n thicker sequences consist of multiple units of varying texture; commonly scoured by icebergs; a 34 w S covered discontinuously by thin veneers (<1 m) of glaciolacustrine and glaciofluvial sediments
10 Tp 4 Tp 4 La ke 5 Calcareous clay diamicton, predominantly derived from Mesozoic Tm shale
18 Calcareous silt diamicton, predominantly derived from Paleozoic na River bi P Tc dolomite and limestone m e Pe Glenora m b in Manitou a La Riviere Boissevain Non-calcareous sand diamicton, predominantly derived from 3 Ninga Neelin Tp Pre-cambrian crystalline rock Tp 3 Tp 3 Rock 0 0
0 Darlingford 0 0 0 La Pilot Mound Thornhill 0 ke 0 5 5
4 Morden 4 Pre-Quaternary
5 3 5 Killarney 3 R Lyonshall i ROCK: > 75% bedrock outcrop; Cretaceous shales above the ve r R Manitoba Escarpment, Paleozoic carbonate-dominated rocks in areas west and south of Lake Winnipeg, exposed typically as B Crystal City a glacially striated, low-relief surfaces; in Precambrian terrane, generally
d
Holmfield g Tp 2 Clearwater Tp 2 unweathered intrusive, metasedimentary, and metavolcanic rocks e Kaleida r Purves having a glacially scoured irregular surface with high local relief
Uncoloured legend blocks indicate units that do not appear on this map. Mather Cartwright Osterwick To aid the reader a shadow effect has been added to exaggerate the topographic relief. 3 3 31 Lena Published by: Manitoba Industry, Economic Development and Mines Manitoba Geological Survey, 2004 Compiled by: G.L.D. Matile and G.R. Keller Tp 1 Snowflake Tp 1 5 18 C r e Modifed from: e k Elson, J.A. 1960: Surficial geology, Brandon, Manitoba; Geological Survey of Canada, "A" Series Map, Map 1067A, accompanies Memoir 300, scale 1:253 440. Mowbray 49° 49°
450 000 475 000 500 000 525 000 550 000 100° 98° R 19 W R 18 W R 17 W R 16 W R 15 W R 14 W R 13 W R 12 W R 11 W R 10 W R 9 W R 8 W R 7 W R 6 W R 5 W Printed 2004 Scale 1:250 000
0 10 20 30
Kilometres
A brief description of the Quaternary landscape of southern Manitoba Major landforms: southern Manitoba Major landforms: NTS 62G 100° 98° 96° 100° Portage la Prairie 98° Assiniboine Delta (underflow fan) alluvial fan G 53° Eastward-facing bedrock escarpments culminating in cuestas which form the Manitoba Escarpment provide a foundation for the 53° e 50° 50° The Pas Moraine or U M ge p Portage la Prairie present-day landscape of southern Manitoba. To the east, the landscape is dominated by Precambrian rocks and bedrock structure, o Is p Portage la Prairie SURFICIAL GEOLOGY COMPILATION MAP SERIES ra la e in n r alluvial fan e d Ca alluvial fan such as faulting, is commonly visible. mp be Dead-ice ll w SG-62G Above the Manitoba Escarpment, the landscape is dominated by hummocky moraine or dead-ice topography, streamlined topography Assiniboine av e- Streamlined landforms spillway cu topography and glacial spillways. Many areas are covered by thick sequences of glacial till representing numerous glacial episodes t s ca Precambrian rp dating back more than 100,000 years. The most recent glacial advances were from the northwest. Glacial till tends to be clay rich. shield Assiniboine Delta (underflow fan) 52° The Interlake is dominated by streamlined landforms and in lower areas, glaciolacustrine depositional basins. Quaternary sediments 52° Surficial geology of the Brandon map sheet tend to be relatively thin and the preservation of older sediments is uncommon, limited to bedrock protected areas such as Sand dunes Dead-ice B e escarpments. Bedrock outcrops are common. Glacial advance was generally from the northwest, parallel to the streamlined topography d (NTS 62G), Manitoba r o c Sand dunes landforms. Glacial till is typically silt rich. Glacial retreat occurred in a series of steps marked by moraines: the Darlingford Moraine k Sand dunes fa u l 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). s 60° U ck Mor p lo rd a p 51° b fo ine Index Map George Island Moraine, contemporaneous with and to the east of The Pas Moraine, is another ice margin of the retreating Rainy 51° e k g 64N 64O 64P 54M r C Precambrian oc a G dr in A m l e l ac shield b lobe. s p ia st r s b l ru a
e f e i lu h D
n l t
l te n - 54L 54K
Dead-ice i e 64K 64J 64I 58° i w s c
b I a
topography a r D In the Precambrian shield, rock outcrops dominate the landscape. Quaternary sediments are commonly thick, but discontinuous, o v
o Alluvial fans i l 58° n e im a e - M r e c i l rarely completely infilling the bedrock lows. Older sediments, including saprolites, are often preserved in the bedrock lows where n r u t i i i 54F s o n 64F 64G 64H 54E t a p a f 54G r l g i s c P l o e a f they are protected from glacial erosion. Glacial advance was generally from the northeast. Glacial till is typically sand rich. l c N w r e o a M B b o 54A r m r a r n – o t d p l h y o l n b l i a e i M 54B T u t a n D 54C e H e 64C 64B 64A 54D 56° As the glaciers retreated, glacial lakes Souris and Hind formed and drained, and glacial Lake Agassiz expanded northward, s a or s g t ain a d l 50° e
a s r 50° Portage la Prairie ir H
c l 56°
B ia p i e 53O progressively covering the entire area below the Manitoba Escarpment. Major Lake Agassiz landforms include the Assiniboine n NTS 62G alluvial fan l i r
d l m 53N l g e way 63O 53M Assiniboine Delta b a 63N 63P Delta, which formed as glacial meltwater flowed from the Assiniboine spillway, and clay plains composed of tens of metres of clay r f n i o Glacial s b Glacial Lake Agassiz r e Lake Hind Sand dunes a and silt. The Herman beaches indicate the highest level attained by Lake Agassiz in southern Manitoba. The Upper Campbell beach clay plain d c Pe M h 53L 53K m H e 63K 63J 63I b d M o s 54° is the best developed of the Lake Agassiz beaches and is evident along the base of the Manitoba Escarpment. in r o e ra a o r r Alluvial fans S Bogs and fens in sp f a m a e 54° i g i n ll lin n a M d w r e n o il a a a Holocene modifications to the landscape include eolian activity (sand dunes) primarily in the Assiniboine Delta and the Sandilands y D b ra n 63F 63G 63H 53E e in d a e s Glacial c Moraine; the Portage la Prairie alluvial fan, from which fluctuating Assiniboine River flow directions over the last 7000 years have Dead-ice h Lake Souris e Alluvial fans 49° 49° topography s 49° 49° 63C 53D been documented; smaller alluvial fans that have developed along the Manitoba Escarpment; large landslide areas (colluvium) that 63B 63A 52° are active along the northern part of the Manitoba Escarpment; and organic accumulations (bogs and fens) with basal radiocarbon 100° 98° 96° 100° 98° 52° Scale 1:4 000 000 landforms indicating Scale 1:1 000 000 landforms indicating dates of approximately 6000 years, that occur in the northeast and extend westward into the northern and eastern Interlake and 62N 62O 62P 52M 800 500 200 0 20 40 80 120 160 direction of ice flow 0 5 10 20 30 40 direction of ice flow Legend southward into southeastern Manitoba. striations indicating Kilometres Kilometres m asl direction of ice flow 62K 62I 52L Map extent 62J 50° 50° 0 90 180 62F 62G 62H 52E Kilometres North American Datum 1983 Copies of this map can be obtained from: Phone: (204) 945-4154 Suggested reference: Universal Transverse Mercator Projection, Zone 14 Manitoba Industry, Economic Development and Mines Toll free: 1-800-223-5215 Matile, G.L.D. and Keller, G.R. 2004: Surficial geology of the Brandon map sheet (NTS 62G), Manitoba; Shuttle Radar Topography Mission elevation data provided by NASA (2003) Manitoba Geological Survey, Publication Sales E-mail: [email protected] 100° 96° 92° 100X Vertical Exaggeration 360-1395 Ellice Ave This map is available to download Manitoba Industry, Economic Development and Mines, Manitoba Geological Survey, Approximate mean declination (2004) for centre of map is 6°27' E, decreasing 6.6' annually. Winnipeg, MB, R3G 3P2 free of charge at Surficial Geology Compilation Map Series, SG-62G, scale 1:250 000. Canada www.gov.mb.ca/itm/mrd