(MANNING SE)

Tsb

Tsb

Qa1

Tgv

Qa2

Tgv

Tgv

QTa

QTa

Tgv

Tgv

Tsb

Qf

Qa1

QTa

Tsb

Qlf

Qa2Qa1

Tsb

Tsb

Qa2

Qa2

Qa2

Qa2

Qa1

Qa2

Qa1

Tsb

Qa2

Qa1

!(8

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Surface GeologyDickinson North Quadrangle, North Dakota

North Dakota Geological Survey24K: Dksn N - sg

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

102o 45' 00"

47o 00' 00"(HIRSCHVILLE SW)

102o 45' 00"

47o 00' 00"

(NEW HRADEC

NORTH)

(SOUTH HEA

RT) (LEHIGH)

(NEW

HRA

DEC

SOUT

H)

102o 45' 00"46o 52' 30"

102o 45' 00"46o 52' 30"

(DICKINSON SOUTH)

(DAV

IS BU

TTES

)

Dickinson North Quadrangle, North DakotaCartographic Comp ilation: Elroy L. Kadrmas

MN12o

1981 Magnetic North Declinat ion at Center of Sheet

0 0.5 1Miles

Scale 1:24,000

USGS 7.5 Minu te Topographic Map Contour Interval 10 Feet1927 North American Datum NGVD 192 9

Road and Hy drologic L ayers Rect ified to 2003 NAIP Digi tal Orth ophoto

Stand ard Parallels 46o 52' 30" and 47o 00' 00"Lambert Co nformal Conic Projection

Robert F. Biek2005

T. 1 40 N.T. 1 39 N.

T. 1 41 N.T. 1 40 N.

OAHE FORMATION

Sand, silt, and clay depos ited by modern streams and rivers. Gravellywhere derived from coarse, older alluvial deposits . Includes river channeland floodplain sediments. Contains numerous truncated meanders andminor terraces. Local similarity to the Sentinel Butte Formation makesthickness determinations difficult; generally less than 20 feet thick.

Modern Alluvial DepositsQa1

RECENT/PLEISTOCENE

Poorly sorted sand, silt, clay, and gravel. Forms planar terrace deposits,elevated relative to modern streams, that are dissected by modern alluvialdeposits. Fluvial (channel and floodplain) sediment generally less than 30feet thick.

Alluvial DepositsQa2

PALEOCENEFORT UNION GROUP

Gray to brown, variably lithified siltstone, mudstone, claystone, sandstone,and lignite. Calcite-cemented sandstone and mudstone concretions arecommon, as are siderite nodules. In this area, the contact with the GoldenValley Formation appears conformable and gradational. Fluvial, lacustrine,and swamp sediment that form gentle, vegetated slopes. Only the upper200 feet of the formation is exposed.

SENTINEL BUTTE FORMATIONTsb

TERTIARY SYSTEMEOCENE/PALEOCENE

Yellowish brown, micaceous, illitic and montmorillonitic siltstone,claystone, and sandstone.

Camels Butte Member

Bear Den MemberLight gray to bright white kaolinitic strata often divisible into 3 strati-graphic units: basal gray zone, middle orange zone, and a thin uppercarbonaceous zone. Often capped by a silicious bed (Taylor Bed) in this area.

GOLDEN VALLEY FORMATIONTgv

Poorly sorted, iron stained, locally iron cemented sand and gravel. Containspebbles and cobbles of locally derived material (mudstone, sandstone,concretions, silicified wood, flint, silcrete, chalcedony), recycled glacialerratics, and lesser quartzite and porphyry (derived from the Black Hillsor Rocky Mountains). Occasional small to medium boulders or localsandstone and mudstone. Occurs as esker-like ridges, a veneer thatcaps hilltops, and deeply eroded deposits with no distinctive topographicexpression. Fluvial (channel) sediment up to 60 feet thick.

QUATERNARY/TERTIARY SYSTEMSand and Gravel DepositsQTa

Geologic SymbolsKnown contact between two geologic units

Approximate contact between two geologic units

Water

! Taylor Bed: Solid dot indicates small exposure.

! Taylor Bed: Open circle indicates lag deposit of Taylor Bed silcrete let down by erosion of underlying beds.

Other Features

Interstate Highway

Paved Road

Unpaved Road

§̈¦94

This g eologic map was funded, in part , by the USGS Natio nal Cooperat ive Geologic Mappin g Prog ram.

R. 96 W. R. 95 W.

R. 97 W. R. 96 W.

EXPLANATIONQUATERNARY SYSTEM

RECENTManmade Features or Deposits

Fill used to create level building sites, reclaim mined land and to builddams, retaining ponds, and other structures. Consists of engineered fill,construction and demolition debris, and general borrow material. Althoughonly selected deposits have been mapped, fill should be anticipated inall built-up areas.

Artificial DepositsQf

Engineered landfill deposits and common dumps.

Landfill DepositsQlf

State Highway!(22

Correlation of Map Units