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Surface GeologySweetwater Quadrangle, North Dakota

North Dakota Geological Survey24K: Swtw - sg

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

98o 45' 00"

48o 15' 00"(DERRICK SW

)

98o 52' 30"

48o 15' 00"

(WEBSTER)

(CAMP GRAFTO

N) (CRARY)

(GRA

ND H

ARBO

R)

98o 45' 00"48o 07' 30"

98o 52' 30"48o 07' 30"

(DEVI LS LAKE)

(CRA

RY N

W)

Sweetwater Quadrangle, North DakotaCartographic Comp ilation: Elro y L. Kadrmas

MN8o 30'

1950 Magnetic North Declinat ion at Center of Sheet

COLEHARBOR GROUP

LAKE SEDIMENT

Sand and gravel; moderately to well sorted; plane bedded and cross-bedded.Shoreline Sediment (Holocene and Wisconsinan)Qcs

Flat bedded, thinly laminated silt and clay, overlying glacial sediment.Nearshore Sediment (Holocene and Wisconsinan)Qclt

T. 1 55 N.T. 1 54 N.

0 0.5 1Miles

Scale 1:24,000

Standard Pa ralle ls 48o 07' 30" a nd 48o 15' 00"

Contour Inte rval 5 Fe et

Lambert Conforma l Conic Projection1927 North Americ an D atum NGVD 1929

Road Layer Re ctifie d to 2003 NA IP Digital OrthophotoUSGS 7.5 Minute Topogra phic Ma p

Lorraine A. Manz2007

EXPLANATION

R. 64 W. R. 63 W.

Borrow AreaQb

OAHE FORMATION

Clay, silt, and organic debris: obscurely bedded; dark colored; deposited in modern ponds and sloughs.

Pond and Slough SedimentQop

QUATERNARY SYSTEM

GLACIAL SEDIMENT

Unsorted clay, silt, sand, gravel, and pebbles, with a few cobbles andboulders; flat to gently undulating topography; trace disintegrationstructures vis ible on air photos; local relief less than 10 feet.

Collapsed Glacial TopographyQccl

Unsorted clay, silt, sand, gravel, and pebbles, with abundant cobblesand boulders; undulating topography; moderately well-defineddisintegration s tructures visible on air photos; local relief 10 to 20 feet.

Collapsed Glacial TopographyQccu

Ridges and hills of poorly to well-sorted sand and gravel intermixedwith cobbles, boulders, and till. Crossbedding, laminae, and soft- sediment deformation structures common. Glaciofluvial material.

Eskers and KamesQcre

GLACIOFLUVIAL SEDIMENT

All map a reas not coded are (Qop) pond and slough sediment.

Flat-bedded sand and gravel deposited by glacial meltwater streams;level to gently sloping surfaces.

River SedimentQcsg

Known contact between two geologic units

Approximate contact between two geologic units

!( Control PointsTes t holes, observation wells, and field observations.

Geologic Symbols

Partially buried meltwater channel

Hilly surface with numerous kettles, nonintegrated drainage, andabundant ice-disintegration features; local relief commonly morethan 100 feet.

Collapsed Glacial TopographyQcch

Glacial sediment that has been draped over glacial or preglacial sedimentor rock that has been sheared up into thrust slabs or folds near the icemargin; hilly areas with intense internal linearity; local concentrations ofgravel and boulders.

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This geologic map was funded in part by the USGSNational Cooperative Geologic Mapping Program.

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Sediment OriginCorrelation of Map Units

OutwashEskersHilly

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Other FeaturesWater

!( State Highway20

Unpaved Road

Paved Road