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NORTH DAKOTA

SOUTH DAKOTA

MONT

ANA

MANITOBA

MINNESOTA

SASKATCHEWAN CANADA49o49o

97o

46o

104o

104o

46o

97o

Ward

Dunn

Cass

McLean

McKenzie

Grant

Morton

Williams

Stark

Stutsman

Wells

McHenry

KidderBarnes

Slope

WalshMountrail

Div ide

Burleigh

Sioux

Burke

Benson

Cavalier

Traill

Bottineau

Emmons

Pierce

Dickey

Richland

Billings

Logan

Mercer

Ramsey

Towner

AdamsBowman

RolettePembina

Eddy

Oliver

Hettinger La Moure

Grand Forks

Steele

Sheridan

Renville

McIntosh

Sargent

Griggs

Ransom

Foster

Golden Valley

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2,000

3,000

6,000 1,000

5,000 4,000

9,000

8,000

7,000

10,000

11,000

12,00013,000

14,000

15,000

1,000

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8,0009,0

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0

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0

12,00

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15,000

Fargo

-

Bismarck

Minot

GrandForks

Mandan

Dickinson

WestFargo

Jamestown

WillistonDevilsLake

Wahpeton

ValleyCity

RugbyStanley

Carrington

Bowman

Hillsboro

Bottineau

Pembina

Parshall

-Medora

-

Watford City

-

-

DEPTH TO PRECAMBRIAN BASEMENT ROCK IN NORTH DAKOTANorth Dakota Geological SurveyGeologic Investigations No. 85

Edward C. Murphy, State GeologistLynn D. Helms, Director Dept. of Mineral Reources

Fred J. Anderson2009

µ

104o

R 100 W103o

R 98 WR 102 W

R 96 WR 92 W

102o

R 90 WR 94 WR 88 W R 84 W

101o

R 82 WR 86 W R 76 W R 74 WR 78 W100o

R 68 W R 66 WR 70 W

99o

R 60 W R 58 WR 62 W R 56 W

98o

R 54 W R 52 W

104o R 100 W103o

R 102 WR 96 W R 92 W

102o

R 94 WR 88 W R 84 W

101oR 86 W R 80 W R 76 WR 78 W R 72 W

100oR 68 WR 70 W R 64 W

99oR 60 W

R 48 W

R 62 W R 56 W

98o

R 54 W R 52 W97o

R 104 W

48o

49o

T 162 N

T 160 N

T 158 N

T 156 N

T 154 N

47o

T 150 N

T 148 N

T 146 N

T 144 N

T 142 N

T 140 N

T 138 N

T 136 N

T 134 N

46o

T 132 N

T 130 N

48o

49o

T 162 N

T 160 N

T 158 N

T 156 N

T 154 N

47o

T 150 N

T 148 N

T 146 N

T 144 N

T 142 N

T 140 N

T 138 N

T 136 N

T 134 N

46o

T 132 N

T 130 N

This map displays the depth (in feet) to Precambrian age (>542 Ma) basement rocks in NorthDakota. These depths represent the total thickness of the Phanerozoic sedimentary rock interval presentabove the Precambrian surface across the state. This map was created from available drilling recordswith reported depth to Precambrian rocks in over 400 basement drillhole penetrations. Additionally,several wells that were completed into the Cambrian Deadwood Formation, which nonconformablyoverlies the Precambrian surface, were included, to better constrain the modeled depth contours whenthey exist at greater depths than surrounding Precambrian basement penetrations. Selected basementpenetrations from the States of Montana, South Dakota, and Minnesota, and the Canadian Provinces ofSaskatchewan and Manitoba, were also included to better constrain the contours along state andprovincial boundaries (Figure1). Depth to basement rock contours have been "clipped" to the NorthDakota boundary. Precambrian basement rocks in North Dakota are predominantly of igneous(granites) and metamorphic (gneisses, schists) origin and are found only in the subsurface. Depths tobasement are commonly greater than 7,000 feet, in the area encompassed by the Williston Basin.Precambrian rocks grade upward from 40 feet per mile between the deepest part of the Williston Basinand the eastern flank and continue to grade at approximately 23 feet per mile well into the Red RiverValley of North Dakota and Minnesota. Precambrian basement rocks are generally less than 300 feetbeneath the surface in the populated areas of the Red River Valley (Table 1). These rocks are less than2000 feet below the land surface along the easternmost quarter of North Dakota in Pembina, Walsh,Grand Forks, Steele, Traill, Barnes, Cass, LaMoure, Dickey, Ransom, Sargent, and Richland counties.The deepest portion of the Williston basin is in excess of 15,000 feet and is located in northwesternDunn County near the Killdeer Mountains. The shallowest depths to Precambrian basement rock arefound along the southern Red River Valley where depths may be less than 200 feet. The rocksencountered in the shallow subsurface in these areas are commonly highly weathered.

Figure 1. Location of wells and drill holes used for the creation of modeleddepth to basement contours. Well control from neighboring states andCanadian provinces used in the construction of this map are shown.

DISCUSSION

Table 1. Approximate depths to Precambrianbasement rocks under selected urban areasin North Dakota. Urban areas are orderedfrom greatest depth to shallowest depth fromtop to bottom.

0 10 20 30 40

Miles0 10 20 30 40

KilometersLamber t Conformal ConicNorth American Datum 1983

Contour Interval = 100 Feet1:750,000Scale

Township Boundaries County Boundaries

Misc Symbols

Wells and Drill Holes

!(

!(

Well Location-Cambrian Deadwood Formation: location of oil, water, or exploratory test well drilled with a total depthcompleted in the Deadwood Formation and deeper than surrounding Precambrian wells.

Well Location-Precambrian Penetration: location of oil, water, or exploratory test well drilled to Precambrian basement rocks.

Geologic SymbolsDepth to Basement Contour (feet). Hachured contour indicates area of approximate maximum depth.

EXPLANATION

Urban Area

REFERENCESAnderson, F.J., 2007, Precambrian Basement Drillhole Map of North Dakota, North Dakota Geological Survey, Geologic Investigations No. 43, 1 :750,000 scale map.Heck, T.J., 1988, Precambrian Structure Map of North Dakota, North Dakota Geological Survey, Miscellaneous Map No. 30., 1:1,000,000 scale map.NDSWC, 2009, North Dakota State Water Commission Online Ground-Water Information Database,NDO&GD, 2009, North Dakota Oil and Gas Division Online Well Information Database,MSTE&M, 2009, Manitoba Science, Technology, Energy and Mines, Online GIS Map Gallery,

McCormick, K.A., , Precambrian contour map of the Precambrian surface of South Dakota, 1:500,000 scale map.MTO&GD, 2009, Montana Oil and Gas Information System,MNDH, 2009, Online County Well Index, Minnesota Department of Health,Moore, W.M., 1978, A Preliminary Report of the Geology of the Red River Valley Drilling Project, Eastern North Dakota and Northwestern Minnesota, Bendix Field Engineering Company, Subcontact #77-159-E, 292 p.Richardson, R.E., 1975, Petrography of Precambrian Iron Formation, Pembina County, North Dakota: Unpublished M.S. Thesis, University of North Dakota, 82 p.SKE&R, 2009, Saskatchewan Oil & Gas Information Sys tem, Saskatchewan Energy and Resources,

Sims, P.K., Peterman, Z.E., Hildebrand, T.G., and Mahan, S., 1991, Precambrian Basement Map of the Trans-Hudson Orogen and Adjacent Terranes, Northern Great Plains, U.S.A., U.S. Geological Survey, Miscellaneous Investigations Series, I-2214, 1:1,000,000 scale map, with pamphlet, 53 p.

in press

http://www.swc.state.nd.us/http://www.dmr.nd.gov/oilgas/

http://www.gov.mb.ca/stem/petroleum/gis/index.html

http://www.bogc.dnrc.mt.gov/jdpIntro.htmhttp://www.health.state.mn.us/divs/eh/cwi

http://www.infomaps .gov.sk.ca/website/SIR_Oil_And_Gas_Wells/viewer.htm