I06C

UNITED STATES

DEPARTMENT OF

THE INTERIOR

GEOLOGICAL SURVEY

Maps of

Alluvial Valley

Floors and

Strippable

Coal in

Forty-two 7

1/2-minute Quadrangles,

Big Horn,

Rosebud, and

Powder River

Counties, Southeast Montana

By

Harold E.

Malde and

J. Michael

Boyles

Open-File Report

76-162

1976

This report

is preliminary

and has

not been

edited or

reviewed for

conformity with U.S.

Geological Survey

standards.

4 5° 3

0'

107

ft

\x

45°

10

7°

JO6°

INDEX TO QUADRANGLE MAPS OF THIS REPORT.

Patterned quadrangles have

no identified

alluvial valley floors2

3

INDEX TO

AERIAL PHOTOGRAPHS USED IN

FIELD MAPPING OF ALLUVIAL VALLEY

FLOORS

1. Environmental

Protection Agency,

scale 1:40,000,

taken 1973.

2. U.S.

Department of

Agriculture, Forest

Service, scale

1:15,840, taken

1962. I

C13.

U.S. Department

of Agriculture,

Soil Conservation

Service,

scale 1:20,000,

taken 1954.

MAPS OF

ALLUVIAL VALLEY FLOORS

AND STRIPPABLE COAL

IN FORTY-TWO 7

1/2-MINUTE QUADRANGLES,

BIGHORN, ROSEBUD,

AND POWDER RIVER COUNTIES,

SOUTHEAST MONTANA

By

Harold E.

Malde and

J. Michael Boyles

EXPLANATION

Areas of

alluvial valley floor

where width along

valley exceeds

25

ft (8

m) Includes stream channel,

flood plain,

and low alluvial

terrace deposits.

May be

sub-irrigated by

underflow of

near-

surface water or

irrigated by diversion of

flood flow.

Alluvial

terraces generally not

higher than

5 ft

(1.5 m)

above channel

floor of

small streams

but as

much as

8 ft

(2.5 m)

high along

principal streams.

Terraces have distinct boundaries along

bordering alluvial fans

and colluvium,

either at

a step

a few

feet (about

1 m) high or,

less commonly,

along a

line at

which

the ground

surface begins to

slope upward.

Vegetation dominantly

grass; mixed with silver

sagebrush (Artemisia

cana) along

small

streams and

in the

upper reaches of

large streams.

Greasewood

(Sarcobatus) and

big sagebrush (A^

tridentata) are

absent or

rare.

Typically used for

growing hay,

in places with supplemental irriga­

tion. Noncultivated areas currently used for

pasturage have poten­

tial for

hay production.

Mapped within Crow Indian Reservation

only where continuous

boundary

with alluvial valley

floor beyond

reservation

\

UD

Area of

high alluvial valley ^loor incised

by narrow sinuous

channel

as deep as

12 ft

(4 m) Forms nearly flat

alluvial terrace

of low

gradient above lower

alluvial valley floor

mapped elsewhere

along

Mispah Creek in

Stacey 4

SE quadrangle.

Mostly used

for growing

hay, in

places with suppleisental

irrigation

Areas of

strippable coal Mapped where maximum overburden thickness

is 150-250 ft

(46-76 m),

depending on

thickness of

underlying

coal. Area commonly includes more than

one bed of

strippable

coal. Straight lines

across some valleys mark limits

for

calculating coal reserves.

Not mapped on

Indian lands.

Mapped

by Matson and

Blumer (1973)

FAULT Dashed where inferred;

dotted where concealed.

U, upthrown

side; D,

downthrown side.

Mapped by Matson and

Blumer (1973)

REFERENCE

Matson, R.

E., and

Blumer, J.

W., 1973,

Quality and

reserves of

strippable coal,

selected deposits,

southeastern Montana,

with analytical data by L.

A. Wegelin:

Montana Bur.

Mines

and Geology Bull.

no. 91,

135 p.

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