North Dakota Geological Survey100K Series: Bwmn - al

Ca rtographic Compilation: E. L. Kadrmas

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

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17%

18%13%

18%

18%

15%

16%20.5%

21.9%

21.9%24.5%

14.6%

3'4'

3'

6'

12'

13'

17'

20'

12'

10'

18'

15'

56

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48

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47

L i t t l e

M i s s o u r i

R i v e r

Indian

Creek

Cash

Cr eek

Boyce

Creek

Can non ball Creek

Mud

Creek

North Butte Cr eek

Butte

South But te Creek

Baco n

Creek

Hay

Creek

Beav er

CreekWorser

Coyote

Creek

Sp ri ng Creek

SpringLake

Spr ing

Creek

L i t t l e

R i v e r

M i s s o u r i

Kid

Creek

BigGumbo Creek

Sevenmi le

Creek

Fivemil e

Creek

NorthFo rk

Grand River

Al ka li

Creek

Col d

Turkey

Creek

Spring

Creek

KalinaLake

S t age

Cr eek

Sp ring

C r e ek

Bowman-HaleyLake

Li ghtning

Creek

Buff alo

Creek

SpringsLake

GascoyneLake

Dee p

Creek

Deep

Cree k

West

Fo

rk

East

Fo rk

StewartLake

Sand

Cr e ek

Ce dar

Creek

Nort h

Fork

South For k

North

Ceda r

Creek

Chan ta

Peta

Creek

Ri ver

C ann

onba llWhiteLake

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SLOPE COUNTYBOWMAN COUNTY

SLOPE COUNTYBOWMAN COUNTY

Fork Gran d

River

Nort h

For k

Grand

Rive r

Lone Tree

Creek

Creek

Bo xelder

Bu ffalo

Cr eek

Lit tle

Creek

Nor th

Rhame

Bowman

Amidon

Gascoyne

Scranto n

Marmarth

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1 11 6 61 6661 1 11 6 16 6

Note: This map was expanded b eyo nd the no rmal Bo wman 100 K Sheet to includ e an additio nal width of two miles west tothe Mon tana border and an additional heig ht of fou r miles south to the South Dak ota border.

103o 00 '

46o 30 'R. 105 W. R. 103 W. R. 102 W. R. 101 W. R. 100 W. R. 98 W.R. 99 W.R. 104 W.R. 106 W.104o 00 '

46o 30 '

T. 13

5 N.

T. 13

3 N.

T. 13

1 N.

T. 13

0 N.

T. 13

2 N.

T. 13

4 N.

T. 12

9 N.

104o 00 '

46o 00 '

103o 00 '

46o 00 '

R. 106 W. R. 104 W.R. 105 W. R. 103 W. R. 102 W. R. 101 W. R. 100 W. R. 99 W.R. 107 W.

Alumina Content of Paleocene ClaystonesBowman 100K Sheet, North Dakota

Adjoining 100K Maps

104o 00 '

46o 30 '

46o 00 '

Merca tor Projec tion 1927 North American DatumStandard parallel 46o 00' Centra l meridian 103o 30'

0 1 2 3 4

Miles

Scale 1:100,000

1981 Magnetic NorthDeclinatio n at Cen ter of Sh eet

13o

Bowman 10 0K Sheet, No rth Dakota

Only a handful of studies have published the alumina (Al2O3) contents of clay-stones in western North Dakota: Clarke (1948), Hansen (1959), Chew and Boyd(1960), Prichard (1980), and Murphy (2012). Clarke (1948) collected 417 samplesprimarily from the Chalky Buttes in Slope County and the Little Badlands in StarkCounty. All but eight of his samples were from bentonites (primarily the SouthHeart Member of the Chadron Formation). Clarke's sample localities were notplotted on any of the map sheets because the current project is focused on thealumina content of kaolin deposits. Hansen (1959) collected 125 claystone samples from 44 sites in the Bear DenMember of the Golden Valley Formation and in the Sentinel Butte and BullionCreek Formations. The only Hansen sample site that plots on this map representstwo analyses. The placement of Hansen's sample sites is not exact because thelocations were only listed down to the section (square mile). Hansen used the legaldescription as his sample number. Chew and Boyd (1960) reported alumina values for 52 sample sites in westernNorth Dakota. They plotted the sample locations on county maps published by theND Highway Department at one inch to the mile and a map of the Deep Creekarea at 0.125 inches to the mile. They also mapped the surface bedrock units,but in the absence of topographic base maps their geologic contacts are not veryaccurate. In numerous instances their locations were modified for a more accurateplot on the North Dakota Geological Survey's surface geology base maps. All ofthe Chew and Boyd analyses reported on this map are from single samples.Chew and Boyd sample numbers were not plotted on the map because noadditional published data is available. The North Dakota Geological Survey collected 232 samples from 62 localities inwestern North Dakota in 2011 and 2012. The initial results were published inNDGS Geologic Investigations no. 158 and the full report will be published inNDGS Report of Investigations no. 112. Multiple samples were collected from allbut the most limited outcrops. The NDGS alumina values plotted on this maprepresent an average of three analyses (range from 2 to 5) per site. Only sample55 represents a single analysis. The alumina value is a weighted percent (the sumof individual analyses were multiplied by individual bed thickness and thendivided by the thickness of the entire kaolin layer).

Edward C. Murphy2013

WHITE RIVER and ARIKAREE Strata (Eocene through Miocene)

Geology Undifferentiated

GOLDEN VALLEY FORMATION (Paleocene and Eocene)The Bear Den Member is generally at the surface along the outer edges (contactbetween the Golden Valley and Sentinel Butte Formations) of the deposit.

The White River and Arikaree rocks were plotted on this map because they maycontain various concentrations of erionite. Erionite is a fibrous zeolite that hasbeen identified by the World Health Organization as a Group 1 carcinogen. Anyproposed mining of the Bear Den in the vicinity of White River or Arikaree rockswill require the overburden be tested for erionite and could, depending uponresults, curtail mining in the area.

RHAME BED (Paleocene)The top of the Rhame Bed marks the contact between the Slope Formation andthe overlying Bullion Creek Formation. The Rhame Bed contacts west of the townof Bowman were taken from Wehrfritz (1978) and Carlson (1979) except in thevicinity of Medicine Pole Hills which came from Murphy and others (1993).Contacts east of Bowman were taken from Carlson (1979). Wehrfritz and Carlsonmapped at a scale of 1:125,000 and Murphy and others mapped at a scale of1:24,000.

REFERENCESCarlson, C. G., 197 8, Geolo gy o f Bowman and Adams Counties, North Dakota: North Dak ota Geolo gical Survey No. 65, Part 1, 29 p . Chew, R.T. III, and Boyd, G.A., 1960 , A preliminary inv es tigation of clay deposi ts in Minnesota, North Dak ota, Mo ntana, No rthern Idaho, and Wash ington; North ern Pacific Railroad Co mpany, Prop erties and Ind ustrial Develo pment Department, 161 p . Clarke, F.F., 1948, Southwestern North Dako ta clay depos its Stark , Slope, and Billings co unties, N.Dak.: U.S. Bureau o f Mines Report of Investigations 3219, 32 p . Hansen, Miller, 1959, Clays of No rth Dako ta as a p otential so urce of alu mina; North Dakota Geolog ical Survey Report of Investig at ion no. 3 3, 15 p. Murphy, E.C., Hoganson, J.W., and Forsman, N. F., 1993 , The Chadron, Brule, and Arikaree Formations in North Dak ota: the but tes of w estern North D ako ta: North Dakota Geological Survery Report of Invest igation s No. 96, 144 p ., 7 plates. Murphy, E.C., 2 012, Alu min a con tent o f the Bear Den Member and the Rh ame Bed in No rth Dakota; North Dak ota Geo logical Su rv ey Geolog ical Invest igatio ns no. 158. Prichard, G.H., 198 0, Auth igenic k aolinite in the Bear Den Member (Paleocene) of th e Gold en Valley Formation in southwestern North Dakota, unpu blished Master's Thesis, University of North Dakota, 174 p. Weh rfritz, B.D. , 197 8, The Rhame bed (Slope Formation, Paleocene), A silcrete and deep-weathering profile, in southwestern North Dak ota: u npublished Mas ter's Thesis, Univers ity of North Dako ta, 158 p.

Other FeaturesWater County Boundary

Section CornersE

Unpaved RoadRiver/Stream - Intermittent

Paved RoadRiver/Stream - Perennial

State Highway!(67Water - Intermittent

104o 00 '

EXPLANATION

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Sample or Site I.D.

Alumina Percent

Bed Thickness(underlined if itis the entire bed)

Murphy (2012)

Hansen (1959)

Chew and Boyd (1960)

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!( Sample not analyzed