GEOLOGIC MAP OF THE HANSEN RANCH QUADRANGLE ...

3 downloads 57 Views 74KB Size Report
GEOLOGIC MAP OF THE HANSEN RANCH QUADRANGLE, ... Vertical -. Horizontal. Strike and dip of joints. ·-·~ Inclined --+-- Vertical + Horizontal. Note: planar ...
U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY

GEOLOGIC MAP OF THE HANSEN RANCH QUADRANGLE, BEAVERHEAD COUNTY, SOUTHWEST MONTANA By J.W. M'Gonigle, M.A. Kirschbaum, and J.N. Weaver

a

0

z

a

!:;; )>

z

0

~

:t [TJ

:::0

f

C) [TJ

0

5

C)

~-


z

(/) [TJ

z

:::0 )>

z

()

:t

0

c)>

~

s:

0

z ...., )>

z

> GEOLOGIC QUADRANGLE MAP

Published by the U.S. Geological Survey, 1991

--------····

Contact - Dashed where approximately located; short dashed where inferred; dotted where concealed · Contact - Showing dip; well exposed at triangle

--------····

Fault - Dashed where approximately located; short dashed where inferred; dotted where concealed Fault, showing dip - Ball and bar en downthrown side Normal fault - Hachured on downthrown side

Strike and dip Jr·beds - Ball indkates top of beds ~rlown from sedimentary struiCtul!s. ~ Inclined EB ~dr.izontal -+- Vertical ~ d>vhturned ~~ Strike and dip oif foliation ~ Inclined

-+-

Strike and dip

Vertical

Horizontal

d·f cleavage

~ Inclined ,_____ Vertical

+

Horizontal

Bearing and plunge of lineation

'5--

Inclined



Vertical -

Strike and dip of joints Fault - Showing relative horizontal movement

+

·-·~ Inclined --+-- Vertical

Horizontal

+ Horizontal

Note: planar symbols (strike and dip of beds, foliation or schistosity, and cleavage) may be co'mbined with linear symbols to record data observed at same locality by superimposed symbols at point of observation. Coexisting planar symbols are shown intersecting at point of observation.

Thrust faul.t - Sawteeth on upper plate

4111--+1--- .... Anticline - Showing direction ot plunge; dashed where approximately located; dotted where concealed

Asymmetric anticline - Short arrow indicates steeper limb

A

Overturned anticline - Showing direction of dip of limbs

- - 1 - - - ..... Syncline- Showmg direction of plunge;

Shafts f!l

>-;x

Asymmetric syncline - Short arrow indicates steeper limb

Minor anticline - Showing plunge of axis Minor syncline - Showing plunge of axis

Accessible >+- Inaccessible

Prospect

~

Abandoned

X

Abandoned

Drilling

9

Shut-in

~

Gas



Oil

~ Show of gas Show of oil

Overturnc::d syncline - Showing direction of dip of limbs Monocline - Showing direction of plunge of axis

Inclined

Quarry ~

.u

~

Adit, tunnel, or slope

...4.....

dashed where approximately located; dotted where concealed

Vertical

Active

Gravel pit

X

Active

Oil well 0



~ Dry hole

abandoned