(NORWICH)

Qcdg

Qcdg

Qor

Qcer

Qccr

Qcrf

Qcch

Qccr

Qccr

Qcer

Qcdg

Qos

Qcrt

Qcrt

Qcer

Qor

Qcer

Qcrt

Ql

Qccr

Qccr

Qcer

Qor

Qos

Qcdg

Qccr

Qct

Qcrt

Qct

Qct

Qor

Qcch

Qos

Qos

Qct

Qcrf

Qcrf

Qos

Qos

Qcch

Qos

Ql

Qcch

Qos

Qos

Qcrt

Qos

Qos

Qos

Qos

Qcrf

Qos

Qcrt

Qos

Qcic

Qos

Qcrt

Qcrt

Qos

Qos

Qos

Qcer

Qcic

Qcrt

Qcic

Qcic

Qcic

Qcic

Qos

Qos

Qcch

Qos

Qct

Qccr

Qor

Qos

Qcic

Qcic

Qos

Qclr

Qor

Qcrf

Qcrt

Qcer

Qcdg

Qcic

Qcer

Qor

Qor

Qcer

Qcer

Qcer

Qcer

Qcer

Qor

Qcdg

Qcdg

Qor

Qcdg

!(41

!(41

!(41

!(97

(/52

(/52

(/52

!(97

!(41

100o 52' 30"

48o 07' 30"(SIM

COE)101o 00' 00"

48o 07' 30"

(SAWYER NE)

(ROBINSON COULEE) (KONGSBERG NE)

(SAWY

ER)

100o 52' 30"48o 00' 00"

101o 00' 00"48o 00' 00"

(BLACKTAIL COULEE)

(VOL

TAIR

E)

Cartographic Compilatio n: E.L.Kadrmas & S.S. Kranich

T. 1 53 N.T. 1 52 N.

T. 1 54 N.T. 1 53 N.

North Dakota Geological Survey24K: Vlva - sg Surface Geology

Velva Quadrangle, North DakotaR. 80 W. R. 79 W.

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

John P. Bluemle2006

MN13o

1948 Magnetic North Declinat ion at Center of Sheet

R. 81 W. R. 80 W.

Velva Quadrangle, North Dakota

This g eologic map was fu nded in p art, b y the USGS National Cooperat ive Geolog ic Mappin g Prog ram.

EXPLANATION

Quate

rnar

yRecen

tOa

he Fo

rmati

onPle

istoc

ene

Coleh

arbo

r Gro

up

Ql

QorQos

River Sedime nt Lake Sediment

QcerQctQcdgQcicQccr Qcrf

QcrtGlacial Sediment

Other Features

State Highway!(41

US Highway(/52

Paved RoadUnpaved Road

Water

Rolling surface with kettles, partially to nonintegrated drainage,and numerous ice-disintegration features; slopes mainly to thesouthwest (toward the Missouri Coteau Escarpment).

Collapsed Glacial Sediment-RollingQccr

Glacial sediment that has been draped over glacial or preglacial sediment or rock that has been sheared up into thrust slabs or folds near the ice margin; hilly areas with intense internal linearity; local concentrations of gravel and boulders; local relief may exceed 150feet.

Ice-Thrust MassesQct

Glacial sediment with flat to undulating topography resulting fromstream erosion in the bottom of large meltwater trenches or overboard areas of till that have been washed by running water;overlain by a thin layer of fluvial sediment of the Coleharbor groupor Oahe Formation in places.

River-Eroded Glacial SedimentQcer

Till FaciesGlacial sediment. Unsorted, unbedded mixture of angular,subangular, and rounded blocks of rock, gravel, and sand,generally in a stiff matrix of silt and clay; yellowish-brown to olive-gray in exposures depending on weathering intens ity; containsdiscontinuous lenses of gravel and sand.

Veneer of till draped over and only slightly modifying the pre-existing topography (pre-glacial bedrock, older till, or gravelsurface); relief up to 75 feet locally; some ice-thrust hills (Qct)that have been subsequently overridden by ice have a thinlayer of till on top and are identified as Qcdg (hard to dis tinguishfrom Qct).

Thin Layer of TillQcdg

Mainly gravel and sand with cobbles and boulders common;inclusions of glacial sediment common; local relief up to 50 feet;eskers and kames.

Ice-Contact DepositsQcic

Mainly gravel and sand along the edges of the Souris River Valley.

River terrace sedimentQcrt

QUATERNARY SYSTEM

OAHE FORMATION

AlluviumRiver and stream sediment. Dark obscurely bedded clay and silt (mainlyoverbank sediment); generally overlying cross-bedded sand (channelsediment); on plains of modern streams.

RECENT

Qor

Dark, obscurely bedded clay and silt; in modern ephemeral ponds.

Pond and Slough SedimentQos

RECENT/ PLEISTOCENE

Variable mixture of strata and deposits that have slid to the bases of slopes.

Landslide DepositsQl

PLEISTOCENECOLEHARBOR GROUPSilt Facies(Insignificant amounts of this facies on this quadrangle)

Sand and Gravel Facies

River sediment. Moderately well-sorted, cross bedded sand and plane-bedded gravel, including sediment of meltwater rivers.

Flat-bedded sediment of nearly level plains and river terraces,commonly with braided channel scars, oxbows, and other relictmarkings; relief of 1 to 10 feet. Mainly along the Souris Riverwith minor occurrences in tributary valleys.

Uncollapsed Flat Fluvial PlainsQcrf

Geologic SymbolsKnown contact between two geologic units

Transverse Ridge

Beach - Scarp

0 0.5 1Miles

Scale 1:24,000

Standard Parallels 48o 00' 00" and 48o 07' 30"

USGS 7.5 Minute Topographic Map Contour Interval 5 Feet

Lambert Co nfo rmal Co nic Project ion1927 North American Datum NGVD 1929

Roads and Hydrologic Layers Rect ified to 2 003 NAIP Digital Orthoph oto