Geology of the Area Southwest of Florence, Fremont County, Colorado

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GEOLOGY OF THE AREA SOUTHWEST OF FLORENCE, FREMONT COUNTY, COLORADO

By

A j i t Kumar G a n g u li

LI BRARY COLORADO - H u u L OF MIMBS G O L D E N , COLORADO

C o lo ra d o S c h o o l o f M ines G o ld e n , C o lo rad o N ovem ber, 1950

ProQuest Number: 10781425

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A t h e s i s s u b m itte d t o th e F a c u l t y an d t h e B oard o f T r u s te e s o f t h e C o lo ra d o S c h o o l o f M ines i n p a r t i a l f u l f i l l m e n t o f th e r e q u ir e m e n ts f o r t h e D egree o f M a s te r o f S c ie n c e »

S ig n e d :

Wl CS Cl G o ld e n , C o lo ra d o D ate s - K c c .

1950

A pproved:

CONTENTS Page A b s t r a c t ................................................................................................................

1

In tro d u c tio n

2

L o c a tio n o f t h e A rea ................................. . . . . . . . . .

2

A c c e s s ib ility

. . . . . . . . .

2

......................................

2

. . . . . .

...................

P u rp o se o f I n v e s t i g a t i o n . . . . . .

M ethod o f I n v e s t i g a t i o n ................................ A cknow ledgm ents G eog rap h y . . . . . R e lie f

. . . . . . . . . . . . . . .............................................................

................... . . . . . .

.....................................

C lim a te and V e g e ta tio n

é . . . . . . . . . .

.

. .

.......................................................

G eom orphology S tra tig ra p h y

M eso zo ic .

.

10

. . . . . . . . . . . . . . . . . .

P re -C a m b ria n

........................

.

.

.

.

.

.

.

.

U pper C re ta c e o u s

.

10 11

...................................................................... .

7

7

. . . ; .....................................

D e t a i l s o f S t r a t i g r a p h i e U n its

6

7

.....................................

G e n e ra l .S ta te m e n t

6

6

. . . . . . . . .

. . . . . . . . .

G eo lo g y

5

6

................................

D ra in a g e . . • v.

C u ltu r e

3

.

.

.

.

.

.

. . . . . . . . .

ll 11 11

D a k o t a ..............................................................................................

11

B en to n

14

N io b ra ra

. . . . . . . . . . . . .

........................ • .

• ............................................................. . . . . .

17

Page P ie rre

,

19

20

T r in id a d "L aram ie" . . . . S t r u c t u r a l G eology

. . . . . . . .

G e n e ra l S ta te m e n t F o ld s

.......................

22

........................................................

. . . . . . . . .

. . .

Summary o f S t r u c t u r e

24

G e n e ra l S ta te m e n t P re -C a m b ria n

............................................................

» . ...........................

P a le o z o ic

......................

M esozoic

M in e r a ls

.

................................................................. .

27 f . • • .

27 27

2S 23 29 29

G round W ater

................................

.......................

O il and Gas

25

27

.........................................

Econom ic G eo lo g y

o

.........................................

H i s t o r i c a l G e o l o g y ................................................................

B ib lio g r a p h y

24

............................................................

F a u l t s .............................................. ........................................................

C oal

24

. . . .

29 29 29 31

PLATES

I.

L o c a tio n m a p ........................* .............................................

page la r

II.

G e n e ra l S t r a t i g r a p h i e Column .......................................

pocket

D e ta il e d Column

pocket

III, IV , V. V I,

C ro s s -s e c tio n

.................................................................. . . . . . . . .

S tru c tu ra l fa b ric A r e a l g e o lo g ic map .

..................................

............................

. . . . . .

...................................

pocket page 23b pocket

ABSTRACT

The a r e a c o v e re d i n t h i s p a p e r i n c l u d e s a p o r t i o n o f th e f o o t h i l l s w hich l i e a lo n g t h e e a s t e r n m a rg in o f t h e Wet M o u n ta in s , F rem ont C o u n ty , C oloradoo em baym ent.

T h is i s a p a r t o f t h e s o u th e r n e x tr e m i ty o f t h e Canon C ity T h e re i s m o d e ra te r e l i e f i n some p a r t s o f t h e a r e a and

t h i s i s i n f l u e n c e d b y t h e s t r u c t u r e an d v a r i a b l e r e s i s t a n c e o f t h e s e d im e n ta r y d e p o s i t s .

The s e d im e n ts d i p a t low a n g le s t o th e e a s t and

g iv e r i s e t o hogback r i d g e s a s a r e s u l t o f d i f f e r e n t i a l e r o s i o n .

The

s t r u c t u r e i s c o m p lic a te d by f o l d s and l a r g e f a u l t s t r e n d i n g n o r th w e s ts o u th e a s t. The s e d im e n ta ry s e c t i o n ra n g e s from t h e D akota f o r m a tio n o f U pper C re ta c e o u s a g e t o t h e Dawson a r k o s i c c o n g lo m e ra te o f l a t e U pper C re ta c e o u s and b a s a l T e r t i a r y a g e . w ith th e p re -C a m b ria n r o c k s .

The D akota b e d s a r e i n f a u l t c o n t a c t

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