New
Mexico
Bureauof Mines
&
Mineral
Resources
Open-File Report 105
MAPS SHOWING THEREGIONAL EXTENT
OF SANDSTONE BODIESWI.THIN THE GALLUP
SANDSTONE COMPILED.FOR.THE SAN JUAN
BASIN HYDROGEOLOGIC STUDY
Nancy H. Mizell, Geologist
and William J. Stone, Hydrogeologist
August, 1979
CONTENTS
....................
.....................
Introduction
1
Purpose
1
Previous work
........ . . . . . . . . . . . .
1
..................2
Acknowledgements . . . . . . . . . . . . . . . . . . 3
Map C o n s t r u c t i o n Methods . . . . . . . . . . . . . . 3
Molenaar (1973and 1 9 7 4 ) . . . . . . . . . . . . 4
Datasources
2
Mercer andCooper
Stoneand
Mizell
F i n a lC o m p i l a t i o n
.............4
(1978) . . . . . . . . . . . . -11
. . . . . . . . . . . . . . . -11
(1970)
Errors Involved i n Compilation
. . . . . . . . . . . . . . .1 2
. . . . . . . . . . . . . . . .1 7
R e s u l t s and Conclusions
Selec'tedReferences
. . . . . . . . . .11
ILLUSTRATIONS
Figure 1
- -
Sampleinduction-electriclogsshowing
sandstone bodies in Gallup Sandstone
10
Table 1
- -
5
Table 2
- -
7
Plate 1
- -
pbcket
Plate 2
- -
pocket
Location of control points used for maps
and cross sections
Distribution, top elevation, and thickness
of sandstone bodies"within_ Gallup Sandstone
Cross sections showing stratigraphic
relationship of sandstone bodies within
Sandstone
Gallup
.
Map showing regional extentof Torrivo
sandstone body,Gallup Sandstone
.~
.-
Plate 3
.
- -
Map showing regional extent
of sandstone
bodies A, B, and.C, Gallup Sandstone',;
pocket
:
Plate 4
- -
Plate 5
--
Map showing regional extent
of sandstone
bodies D, Eland E', Gallup Sandstone
Map showing thicknessoi!:.sagdstone
..
within
Gallup
Sandstone
bodies
pocket
pocket
1
INTRODUCTION
Purpose
This studywas designed
t o i n t e r p r e t the r e g i o n a l
extentofthesevensandstonefacies
d e s c r i b e d byMolenaar(1973).
f a c i e s ,d e s i g n a t e d
A,
B, C,
of GallupSandstone
H e i d e n t i f i e ds i xm a r i n e
D , E , and F sandstones,
and a s i n g l e nonmarine f a c i e s whichhe
Sandstone P4ember.
named t h e T o r r i v i o
of t h e v e r t i c a l
b ec a l l e ds a n d s t o n eb o d i e s .D e l i n e a t i o n
and h o r i z o n t a l limits o f t h e s a n d s t o n e b o d i e s
futurestudiessuch
system in the
will
I nt h i sr e p o r tM o l e n a a r ' sf a c i e s
w i l l aid
as r e f i n i n g a model oftheground-water
San Juan Basin.
Previous Work
Numerous p u b l i c a t i o n s i n t h e g e o l o g i c l i t e r a t u r e
many more d e a l w i t h
describe the Gallup Sandstone, and
t h es t r a t i g r a p h y
of t h e San JuanBasin.
Only t h o s e
investigationsthataresingularlysignificantarecited
here.
A b r o a d e rb i b l i o g r a p h y
may beobtained
by c l o s e
study of the specific papers cited.
Sears (1925) named theGallupSandstoneforoutcrops
near the city
of G a l l u p , e s t a b l i s h i n g t h e t y p e a r e a t h e r e .
Beaumont (1957)describedtheGallupSandstonealongthe
westernmarginoftheSanJuanBasin
and Dane andoddiers:
( 1 9 5 7 )d e s c r i b e dt h ea g ea n ds t r a t i g r a p h yo ft h eG a l l u p
Sandstonesouthand
east of t h et y p ea r e a .U s i n g
electric-logdataStoneand
M i z e l l (1978) tracedtheGallup
S a n d s t o n et h r o u g ht h es u b s u r f a c ei nt h e
San JuanBasin.
2
a
Other sources o f s u b s u r f a c e d a t a
d r i l l i n gr e p o r t s .I n
are ground-waterand
t o theGallupSandstone
Cooper ( 1 9 7 0 ) p r o v i d e d d a t a p e r t a i n i n g
area.
a q u i f e rs y s t e mi nt h eG a l l u p - T o h a t c h i
ground-waterstudies
Mercer and
a ground-waterstudy,
of t h e GallupSandstone,
More recent
by Mercer and
L a p a l l a ( 1 9 7 2 ) and H i s s and M a r s h a l l( 1 9 7 5 )i n c l u d er e s u l t s
of pumping t e s t s as well as c o r e and e l e c t r i c - l o g d a t a .
Detailedstratigraphicstudies
of theGallupSandstone
since its definition have resulted in
a better understanding
for t h e u n i t .
of t h e d e p o s i t i o n a l e n v i r o n m e n t s r e s p o n s i b l e
Budd (1957)suggestedfour.faciestrendsdevelopedwithin
theGallupSandstone.Campbell
San Juan Basin,
of the Gallup Sandstone in the northwestern
suggestedtheGallup
shoreline.
a study
( 1 9 7 1 and1979),from
as a d e p o s i t i o n a l model of a beach
Campbell ( 1 9 7 2 ) a l s o discussedoffshoreage
e q u i v a l e n t s of t h eG a l l u pi nn o r t h w e s t e r n
otherstudies
New Mexico.
In
of n o r t h w e s t e r n New MexiAo, Molenaar(1973,
1 9 7 4 ) d i s c u s s e dt h es a n d s t o n e
facies i n t h e G a l l u p .
Data. Sources
The d a t a u s e d i n p r e p a r a t i o n
of this study
o u t c r o p d a t a , p u b l i s h e ds u b s u r f a c ed a t a ,
are p u b l i s h e d
and p u b l i s h e d facies
i n t e r p r e t a t i o n s .O u t c r o pd a t ac o n s i s to fm e a s u r e ds e c t i o n s ,
which are shown on P l a t e 1 i n c r o s s s e c t i o n
fromMolenaar(1973,
1974).
The p r i n c i p a l s o u r c e
Molenaar(1973,
form,modified
of s u b s u r f a c e o r well d a t a i s
1 9 7 4 ) withsupplementarydatafrom
Mercer
3
andCooper
( 1 9 7 0 ) and Stone and M i z e l l ( 1 9 7 8 ) .
Cross
w e l l d a t a fromMolenaar
s e c t i o n s on P l a t e 1 p r e s e n t
Sample l o g s , e l e c t r i c l o g s ,t o pe l e v a t i o n s
(1973, 1 9 7 4 ) .
were^ drkwn from .Me.rcer and
and t h i c k n e s s e s . o f u n i t s
Cooper ( 1 9 7 0 ) .
Well d a t a from Stone and M i z e l l (1978)
c o n s i s to fn i n e
e l e c t r i c l o g s .F i q u r e
1 shows r e p r e s e n t a t i v e
samplesofthelogcharacteristicsofeachofMolenaar's
(1973)sandstonebodies.
DatafromMolenaar's(1973,
thebasisforthe
1974)cross s e c t i o n s a r e
maps o ft h e
A,
B,
C , D, E ,
s a n d s t o n eb o d i e so ft h eG a l l u pS a n d s t o n e .
surfaceelevations,usedto
t h i c k n e s s of eachbody,
F,
a n dT o r r i v i o
The sourcesof
compute t o p e l e v a t i o n s
and
are O'Sullivan and Beikman (1963),
Hackman and Olson ( 1 9 7 7 ) , and Wyant andOlson
(1978).
ACKNOWLEDGEMENTS
W
e wish t o thank C.M.
d r a f t s of P l a t e s 1 - 4 .
Molenaar f o r r e v i e w i n g o r i g i n a . 3
H i s comments andsuggestionshavebeen
h e l p f u l ' b u t any e r r o r s t h e r e o n a r e o u r s
alone ....,
MAP CONSTRUCTTON METHODS
The approachused
i n thisstudyincludesfoursteps:
1) a comprehensive review o f t h e l i t e r a t u r e p e r t a i n i n g t o
t h eG a l l u pS a n d s t o n e ;
paperstodetermine
2 ) e x t e n s i v es t u d yo fs i g n i f i c a n t
methodsof
3 ) c o m p u t a t i o no ft o pe l e v a t i o n
sandstone body;and
extractinguseableinformation;
and t h i c k n e s so f
4 ) f i n a lc o m p i l a t i o no fd a t a
each
from selected
4
papers needed
t o produce m.aps s h o w i n g t h e r e g i o n a l e x t e n t
of t h es a n d s t o n eb o d i e s .
Uniqueproblemswitheachdata
sourcenecessitateseparatediscussionofthemajorsources.
Molenaar(1973and
Threetypes
1974)
of d a t a u t i l i z e d
fromMolenaar(1973,
i n c l u d e : 1) l o c a t i o n of well c o n t r o l p o i n t s ( T a b l e
2 ) l o c a t i o n of o u t c r o pc o n t r o lp o i n t s( T a b l e
3 )c r o s ss e c t i o n so f
1974)
1);
1); and
the S a n ' J u a nB a s i n .E l e v a t i o n sf o r
were determined from
thetopoftheGallupSandstone
g e o l o g i c maps ( O ' S u l l i v a n and Beikman, 1963; Hackman and
Olson, 1 9 7 7 ; Wyant andOlson,
l o c a t i o n s( T a b l e
1 9 7 8 ) and u s i n gc o n t r o l - p o i n t
1 ) . E l e v a t i o n sf o rt h et o p
and t h i c k n e s s e s
0-f-eachsandstone body (Table 2 ) were determinedfromcross
s e c t i o n s( P l a t e
1) a n dp r e v i o u s l yc a l c u l a t e dt o pe l e v a t i o n s
fortheGallupSandstone.
Mercer andCooper
Selecteddata
(1970)
from Mercer andCooper
( 1 9 7 0 ) were chosen
because: 1) t h e i r wells p e n e t r a t eG a l l u pS a n d s t o n ei nt h e
area east
and n o r t h o f t h e c i t y
i s notalreadycovered
of Gallup; 2 ) t h e i r l o c a t i o n
by Molenaar's data, but
enough t o o t h e r d a t a t o a l l o w c r o s s c h e c k i n g ;
e l e c t r i c l o g sa r ea v a i l a b l e .
is close
3 ) sample o r
Four wells (Table 1) meet
these c r i t e r i a and were u s e d i n c a l c u l a t i n g t o p e l e v a t i o n s .
5
TABLE 1
L o c a t i o n of c o n t r o l p o i n t s used f o r maps and cross sections;
M = Molenaar ( 1 9 7 3 ,1 9 7 4 ) ,
MC = Mq:rcer and CoopeT. (197!3)., and
SM = Stone and M i z e l l ( 1 9 7 8 ) .
See p l a t e s 1, 2 , 3 and 4 .
.
Part I
-
,
.
.
.
.
.
I
. . . .
Surface c o n t r o l
Control
Location
Reference
Point
4
5
6
7
8
9
10
11
12
13
14
15
16
22
23
27
28
29
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
62
63
64
SWk
30-31N-19W
5-30N-19W
20-30N-19W
12-29N-20W
26-29N-20W
7-28N-19W
25-28N-19W
17-27N-19W
33-27N-19W
18-26N-19N
31-26N-19W
30-25N-19W
12-24N-20W
31-24N-19W
16-23N-19W
27-23N-19W
19-20N-19W
17-18N-20W
12-17N-21W
36-17N-21W
31-15N-20W
29-15N-19W
13-15N-18W
15-16N-17W
7-16N-16W
ll-16N-16W
22-16N-15W
3-16N-15W
15-16N-14W
4-15N-13W
9-15N-12W
7-15N-llW
36-15N-llV?
4-14N-10W
1-14N-10W
22-14N-9W
6-13N-8W
28-12N-8W
2-10N-8W
19-llN-6W
4-llN-5W
30-13N-4W
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Cross
Section
A-A
A-A '
A-A '
A-A '
A-A '
A-A '
A-A '
A-A '
A-A '
A-A
A-A '
A-A '
A-A '
A-A'
A-A '
A-A '
A-A '
A-A
A-A
A-A '
c-c '
c-c '
c-c '
c-c '
c-c '
c-c '
c-c '
c-c '
B-B',
c-c
c-c '
c-c '
c-c
c-c
c-c I
c-c '
c-c
c-c '
D-D '
D-D '
D-D '
D-D '
C-C'
6
65
66
67
68
69
SE$
SW%SW$
NEkSWk
E%
NW%NW%
4-13N-4W
7-14N-3W
27-15N-3W
10-15N-3W
36-16N-2W
M
M
M
M
M
D-D
D-D
D-D
D-D
D-D'
'
P a r t 11-Subsurface C o n t r o l
Control
Point
1 01
:~102
1 03
104
105
106
1 07
108
109
110
..117
~ ~ 1 1 8
120
121
93
94
95
96
Well
Location
Well
20-15N-18W
28-15N-18W
8-18N-12W
26-20N-13W
18-21N-12W
23-23N-12W
29-24N-llW
17-25N-llW
9-26N-llW
10-27N-llW
33-15N-8W
9-15N-7W
25-16N-5W
29-17N-4W
8-15N-18W
3-15N-19W
17-16N-18W
27-19N-18W
Doty Water Well
Maddox
Jones and P e a c h e e
S i n c l a i r No.1
S i n c l a i r No 1
H u m b l e O i l No.
Magnolia P e t . No. 1
S h e l l O i l No. 1 1 3 - 1 7
P a n American P e t . No. 1
S i n c l a i r No. 7
R.A. Crane, Jr. No.1
C r o w nC e n t .
P e t . No. 6
Hughes and Hughes N o . 1
R e f i n e r s Pet: No. 1
Gallup 15
Miller-Gamerco 1
292
30 2
311
22-21N-llW
19-20N-llW
32-19N-12W
312
14-19N-llW
334
343
347
366
371
8-17N-7W
5-15N-6W
29-19N-17W
33-16N-8W
32-18N-16W
Name
H.P.
V.F.
MWoz 1-A
B u r e a u Indian A f f a i r s
14T-514
T e s o r o Pet. 1 Boundary
Davis O i l 1 Wild Card
Hughes & Hughes 1 S t a t e
T r a c t 18
S i n c l a i r 1 S a n t a Fe 7 4
N. Ranch
Davis O i l 1 E l T i g r e
S h a r - A l a n 2 Fernandez
P u r e O i l 1 Coyote Canyon
S h a r - A l a n 3 Fernandez
S u p e r i o r O i l K-1 Navajo
Ref.
M
M
M
M
M
M
fif
M
M
M
M
M
M
M
MC
MC
MC
MC
SM
SPI
SM
SM
SM
SM
SM
SM
SM
Cross
Section
c-c '
B-B '
B-B '
B-B
B-B '
B-B
B-B
B-B
B-B
B-B
'
'
TABLE 2
Distribution, top elevation, and thickness
of sandstone bodies within the Gallup
ft) See Plate.
1;. 2,'3 and 4
Sandstone (top elevation; $t/thicXnes$,
.
Control
Member; Point
Torrivio
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
27
28
29
38
39
40
41
42
43
44
45
D B
A
Missing
6750/59
6200/65
6200/39
6800/46
7000/20
6400/115
7000/:80
7718/66
? /70
? j44.,,
5755/27
? /?.O .,
6378/100
6279/60
7140/75
Present
6900/40
? /30
7234/49
7200/31
Missing
7385/24
Missina
? /55
Missing
6691/60
C
E
F
5000/lO
5000/20
5250/40
5600/40
5578/50
5571/54
5570/57
?
- I/5n
"
? /46
~
6135/80
6128/57
6680/29
6911/30
Missing
Missing
6282/49
6917/55
7586/21
Missing
Missing
6881/10
6233/30
6862/37
7550/20
: ?_ J30'
?' /25
5662/36
. ?. /i 5..
6219/58
6550/45
6994/84
Missing
~
Missing
7050/56
Present
6850/47,
? /40'.
7171/32
7140/42
8020/57
7320/62
Missing
/88
? /120
5581/105
? /48
6122/15
6460/64
6867/19
Present
I' ?
?
?
?
?
7180/30
7130/19
? /46
6043/46
6340/54
6748/8
?
?
?
6963/50
?
Missing
TABLE 2, continued
Control
Member.
Point
46
47
48
49
50
51
52
53
62
63
64
65
66
67
68
69
101
102
~ 13
0
104
105
106
10 7
108
109
110
117
Torrivio
A
6000/98
6000/60
7000/85
600/85
P
E
7470/80
7280/61
7420/81
? /150
7440/126
7260/101
7300/66
7129/32
7215/26
Present
Present
7037j19
?/73
7680/75
6080/75
6770/110
?
?
D
C
Missing
?
/33
Missing
?
.
?/
54
?
?
Missing
?. ../8'3
Missing
? /110
Missing
Missing
? /88
Missing
?
/30
?
?
?
.
?.'/SO
?/
'60
.- ? /60
/45
/56
/lo5
Missing
6730/100
5500/90
118
120
121
93
94
B
6055/30
6025/100
Missing
5398/?
5740/?
5290/?
Missing
m
5190/?
5610/?
5100/?
5538/?
0
TABLE 2 ,c o n t i n u e d
Control
Point
95
96
292
302
311
312
334
343
34 7
4929/31
36 6
371
Torrivio
Member
A
5102/?
5300/?
D
C
B
E
F
Missing
4730/?
4872/?
4992/?
4960/?
5070/?
5275/?
3405/140
3972/130
4928/40
4743/130
4822/10
4972/33
4289/120
4812/43
5711/100
4533/45
4289/120
4761/24'
5556/30
5252/20
5545/15
5505/33
5460/35
5132/42
5395/30
W
10
Fig. 1
Sample induction.electric logs showing
sandstone
bodies
(stippled) in Gallup
Sandstone; a from well 312, b from well 106, c from well 371 (Tablel).
Km = Mancos Shale.
11
M i z e l l (1978)
Stoneand
were selected. t o
DatafromStoneandMizell(1978)
f i l l i n gapsfrom
other sources and especially the central
a n de a s t e r ne d g eo ft h es t u d ya r e a .
Top andbottomelevations
I
beady;
are based on e l e c t r i , & l o g " p i c k s " f o r . e a c h s a n d s c o n e
,
examples are
shown i n f i a u r e . 1 .
'
'~
I
The t h i c k n e s s . o f . s a n d s t o n e
I"
b o d i e s idetermined.
s then
-
Final Compilation
S t e p si n v o l v e di nf i n a lc o m p i l a t i o ni n c l u d e :
p a r i s o no fa l le l e v a t i o nv a l u e s( T a b l e
1) com-
2 ) t o d e t e r m i n et h e
i.e.
correctverticalpositionofthesandstonebodies,
t h e C sandstone i s p l o t t e d on t h e C sandstone boay. map
and n o t t h e
D o r E sandstones; 2 ) u s e o f c r o s s s e c t i o n s
A-A',
C-C',
B-B',
and D-D'
on P l a t e 1 t o d e l i n e a t e h o r i z o n t a l
boundariesofeachsandstonebody;
3) d a t a p r o j e c t i o n
and
i n t e r p r e t a t i o n f o r a r e a s ; . v & e r e , d a k a .are ,,scarce or. l a c k i n g .
The f i n a l r e s u l t s
are a map o f t h e T o r r i v i o S a n d s t o n e
( P l a t e 2 ) , a map o ft h e
A,
B and C s a n d s t o n eb o d i e s( P l a t e
a map of t h e D , E and F s a n d s t o n eb o d i e s( P l a t e
isopach maps ofeachsandstone
EFrorsTnvolved
body
4),
and
body ( P l a t e 5 ) .
inCompilation
The accuracy of t h e t o p e l e v a t i o n a n d t h i c k n e s s v a l u e s
(Table 2 ) used t o make r e g i o n a l e x t e n t
sandstone bodies within the Gallup Sandstone
andisopach
maps f o r
is estimated
3),
12
t o bebetween
+-
80 and 9 0 p e r c e n t f o r t h i c k n e s s . a n d .
150 f t f o r t o p e l e v a t i o n s . T h i s t o p e l e v a t i o n e r r o r f a c t o r
combines e r r o r s from: 1) measured s e c t i o n s (P.lolenaar, 1973,
p. 8 6 ) ; 2 ) c a l c u l a t i n gs u r f a c ee l e v a t i o n s ;
3)determining
( 1 9 7 3 , 1 9 7 4 ) c r o s ss e c t i o n s ;
topsandbottomsfromMolenaar's
and 4 ) choosingtopsandbottomsfrom
e l e c t r i c andsample
I
logs.
These e r r o r s s h o u l d n o t d e t r a c t !
o ft h e
maps o f Fhe sandstonebodies.
from. t h e u s e f u l n e s s
i
I
RESULTS AND: CONCLUSIONS;
,
1.
The T o r r i v i oS a n d s t o n e
body ( P l a t e 2 ) extends
e a s t w a r df r o mm e a s u r e ds e c t i o n1 3( n o r t ho fS a n o s t e e )t o
e
'
w e l l 105 (west of Chaco Canyon),thensouth
s e c t i o n 45 ( s o u t h e a s t of Crownpoint).
I
t o measured
Inthisareathe
Torrivio Sandstone
i s thehighestsandstone
Gallup.
Cross
sections
A-4' and B-B'
body i n t h e
( P l a t e 1) s u g g e s t
t h e T o r r i v i o may merge w i t h the A and B sandstones
(Molenaar, 1 9 7 9 , written' c o r n m i c a t i o n ) , a n d n e v e r o v e r l i e
t h e A.
T h e . T o r r i v i oS a n d s t o n er a n g e si nt h i c k n e s s( P l a t e
5)
from 1 0 0 ff a t .measused s e c t i o n . .28 ( w e s . t . . o f ~ G a l l u p ) t o .
2 0 f t 'at measurea section
2.
1 7 ( s o u t h of^ S a n o s t e e ) .
Croppingoutnorthwardfrommeasuredsection
( n o r t h of Sanostee) , t h e A s a n d s t o n e ( P l a t e
f a r t h e s t toward t h e c e n t e r o f
extends eastward in
a
the b a s i n .
12
3 ) .extends
The A sandstone
a narrow b e l t from northwest
of B i s t i
t o measured s e c t i o n 6 8 ( 2 4 miles west of San Ysidro)
A t thesurface,the
-
A sandstone i s o n l y s e e n t o o v e r l i e t h e
13
B a t measured s e c t i o n 1 2 , however, i n t h e s u b s u r f a c e t h e
o v e r l i e st h e
B,
and t h e C ( P l a t e 1. ) .
Cross s e c t i o n B-B'
( P l a t e 1) shows t h e A sandstone t o b e h i g h e r t h a n t h e
b u ti n
D-D',
A
B,
(1979,
t h e A doesnotappearhigher.Molenaar
written'.communication)suggestedtheabsenceofabrupt
s t r a t i g r a p h i c rises.. in t h e s o u t h e a s t .&rt o f t h e b a s i n ,
,
whe.re sandstone, bodies A,, B, and C.;'may. a l l
'I
merge t o g e t h e r .P l a t e
5 shows t h e A s a n d s t o n e body t h i c k e n i n g
From 55 f t a t measured.
towardthecenterofthebasin.
s e c t i o n 1 2 (northofSanostee)
on t h e &est, and 98 f t
measured s e c t i o n 6 7 (southwestof
at
San Ysidro) on t h e e a s t ,
s a n d s t o n e body A t h i c k e n s t o 1 4 0 fC a,t!well 2 9 2 (west of
Chaco Canyon)
3.
.
The B sandstoneextendsnorthfrommeasuredsection
1 6 ( s o u t h of S a n o s t e e ) t o
B i k l a b i t o ) , and eastward
1 0 4 and 2 9 2 (southwestof
(1973)suggestedthe
Chaco Canyon) t o well 343 (west of
B-B').
A and C.
Molenaar
B and C s a n d s t o n e s are s e p a r a t e f a c i e s
thickness changes in overlying nonmarine
depositsbetweenmeasuredsections15and
s e c t i o n A-A')
wells
i n a b e l t which t h i n s n e a r
it merges w i t hs a n d s t o n e s
Sail Ysidro)where
based onsudden
measured s e c t i o n 6 . ( s o u t h of
1 6 ( P l a t e 1, c r o s s
and wells 1 0 4 and 1 0 6 ( P l a t e 1, c r o s s s e c t i o n
Sandstone body B v a r i e sv e r ya b r u p t l yi nt h i c k n e s s
i nt h ec e n t e ra n de a s t e r n
t h ew e s t e r no u t c r o pt h e
marginofthebasin
B i n c r e a s e sf r o m
In
(Plate 5 ) .
29 f t a t
measured
s e c t i o n 30 (southwest of S a n o s t e e ) t o a maximum t h i c k n e s s
of 80 f t .t~ measured sec.tion .14'( w e s t pf Sanostee)
,
and
.
14
thendecreasesto
2 0 f t toward t h e n o r t h a t
body i s t h e
The most extensivemarinesandstone
I t extends west from theoutcrop,measured
C ( P l a t e3 ) .
well 9 5 ( n o r t ho f
s e c t i o n s 6 2 t h r u 6 4 ( n o r t ho fL a g u n a ) ,t o
Gallup)andmeasuredsections
Sanostee).
2 0 t h r u1 3( n o r t ho f
The C sandstone body o v e r l i e st h e
F (Plates 1, 2 , 3,and
4).
D , E , and
Sandstone body C a p p e a r st oh a v e
no d e f i n i t et h i c k n e s sp a t t e r n( P l a t e
T h i c k n e s so ft h e
5).
15 f t a t we.11-371.(urest~.o.f"Crownpoi,fit),eo- .
C ranges from
150 f t a t measured s e c t i o n 49 (northwest of
5.
I
.
section 4 (eastofBikalbito)
4.
measured
P;mbrosia Lake)
Sandstone body D ( P l a t e 3)cropsoutinanoblong
( 1 8 miles northwest of
area between measured sections 23
Gallup)and
1 7 (southofSanostee)
on t h e e a s t , a n d
betweenmeasured
on t h e west, well 371
s e c t i o n s 2 7 ( 2 miles west
39 ( 1 8 miles n o r t h e a s to fG a l l u p )
ofGallup)and
s o u t h ( P l a t e 1, c r o s s s e c t i o n s
body p r i n c i p a l l y o v e r l i e s t h e
a r e a si nt h es o u t h
A-A'
, C-C')
.
E but also the
and e a s t ( P l a t e
4).
sandstone body D t o r a n g e i n t h i c k n e s s
on t h e
The D sandstone
F $n-gma,ll
. .
P l a t e 5 shows
from 1 0 f t at^
measured s e c t i o n 1 7 ( s o u t h o f S a n o s t e e ) i n t h e n o r t h , t o
84 f t . a t m e a s u r e d - s e c t i p n ~ . 3 8 _ ( n o r t h w e s b b f G a l l u p ) i n t h e
south.
The D a p p e a r st ob e
more e v e n l y d i s t r i b u t e d t h a t
t h e other sandstone bodies.
6.
.
Sandstone body E i s developed i n two p o c k e t - l i k e
.rn t h e west t h e E e x t e n d s west t o t h e
a r e a s( P l a t e
4).
outcropfrom
well 371 t o measured s e c t i o n 2 0 (southwestof
15
well 371 t o measured s e c t i o n
SheepSprings)andsouthfrom
38 ( 1 2 miles east of G a l l u p ) .
southwestfrom
The e a s t e r n area e x t e n d s
well 366 ( s o u t h of S t a r Lake) t o t h e o u t c r o p
a t measured s e c t i o n 4 4 ( s o u t h e a s t o f C r o w n p o i n t ) ,
t o theoutcrop
a t measured s e c t i o n 62 ( n o r t h w e s t of Laguna).
The E i s m i s s i n g toward t h e c e n t e r o f t h e b a s i n
t o b ed i s c o n t i n u o u s
a t t h es u r f a c e
andappears
( P l a t e 1, c r o s s s e c t i o n
The E s a n d s t o n e body o v e r l i e s t h e
C-C').
and s o u t h e a s t
F betweenmeasured
I
s e c t i o n s 2 7 (west of Gallup)and
(east ofGallup),
29 ( i nG a l l u p ) ,
and 52 and 53 (south
Thickness of sandstone
Mateo).
iofSan
body E i n t h e w a s t e r n
38 and 39
area rangesfrom
1
1 2 0 f t . a t measured s e c t i o n 22: ( n o r t h e a s t of G a l l u p ) t o 1 5
ft
~
a t measured s e c t i o n 2 8 (west o fG i l l u p )( P l a t e5 ) .I n
the eastern
area t h e t h i c k n e s s
i s n o t so g r e a t and r a n g e s
t measured s e c t i o n 4 6 (southeast .of Crownpoint)
from 66 f t a
t o 15 f t a t measured s e c t i o n 4 9 . ( n o r t h e a s t o f ~ A m b r o s i a . .
Lake)
.
7.
Sandstone body F i s developed i n small pockets
a l o n gt h es o u t h e r nG a l l u pS a n d s t o n eo u t c r o pb e l t
(Plate 4 ) .
Tn t h e e a s t t h e F i s found i n measuredsections
( s o u t h of San Mateo), with
s e c t i o n5 3
a thicknessof
( P l a t e 5 ) .I nt h e
54 f t a t measured
west i n two areas, between
measured s e c t i o n s 38 ( e a s t ofGallup)and
Crownpoint)and
52 and53
well 3 7 1( n o r t ho fG a l l u p ) ,
42 (west of
andmeasured
s e c t i o n s 27 (west ofGal1up)and
2 9 ( i n Gallup).Thickness
of s a n d s t o n e body F rangesfrom
6 0 f t a t well 101 ( i n G a l l u p )
t o 8 f t a t measured s e c t i o n 39 ( e a s t o f G a l l u p ) .
16
SELECTED
REFERFNCES
Beaumont, E. C., 1957, The Gallup Sandstone as exposed
in the
western part of the San Juan Basin: Four Corners Geological
p. 114-120
Society, Guidebook 2nd field conference,
Budd, Harrell, 1957, Facies development of the Gallup Formation:
Four Corners Geological Society, Guidebook 2nd field conference, p. 121-127.
Campbell, C. V . , 1971, Depositional model--Upper Cretaceous Gallup
beach shoreline, Shiprock area, northwestern New Mexico:
Journal of Sedimentary Petrology,v. 41, no. 2, p. 393-409
Campbell, C. V., 1973, Offshore equivalents of upper Cretaceous
Gallup beach sandstone, northwestern New Mexico: Four Corners
Geological Society, Guidebook 18th field conference,
p. 78-84
Campbell, C: V . , 1979, Model for beach
shoreline.inGallup Sandstone (Upper Cretaceous) of northwestern New Mexico: New
Mexico Bureau of Mines and Mineral Resources, Circ. 164, 32p.
Dane, C. H., Bachman, G. O., and Reeside, Jr., J. B.., 1957, The
Gallup Sandstone, it's age and stratigraphic relationships
south and eastof the type locality: Pour Corners Geological
Society, Guidebook 2nd field conference, p. 99-113
Hackman, 8. 3 . , and Olson, A., B., 1977, Geology, structure, and
Mexico. and
uranium depositsof the Gallup 2' shee~;New
Arizona: U . S . Geological Survey, Misc. Geol. Xnv. Map 2-981
Hiss, W. L., and Marshall, J, G., 1975, Xnterpretatjon of geologic
Gallup,
and hydrologic data grom the Ray-1 well, of
city
McKinley County, New Mexico: U.S. Geological Survey, OpenFile Repk. 75-573, 58p.
Kirk, A. R.., and Sulliyan, M. W.., 1976, PrelLrninary.geolpgic map
of the DaltonPqss quadrangle, McKinley County,
New Mexico:
U.S. Geological Survey., Open-Pile Rept, 76-184,
nap
Kirk, A. R,, and Zech, R. S . , 1976, Prelininary,geolpgic andstructwe
contour maps of the oak Spring quandrqngle, McKinley County,
New Mexjco: U,S. Geolpgical Survey, Open-Pile Repti 76-347,
map
Mercer, 3. W., and Cooper,J.. B., 1970, &vailabilj;ty of groundwi+tex
in the Gallup-.Tohatchi
area, NcKinley County, New Mexico:
U.S. Geological Survey, Open-Pile Rept. MK-31, 194p.
Mercer, 9. W., and Lappala, E. G,, 1972, ETwip-1 pmduction well,
U,S.' Gedl09iCal
ckty QZ Gallup, McKinley County, New Mexico;
Survey, Open-File 'Rept., 53p.
17
Molenaar, C. M.
, 1973, Sedimentary facies and correlations
of the
Gallup Sandstone and associated formations, northwestern
New
Mexico: Four Corners Geological Society, Guidebook 18th
field conference,p. 85-110
Molenaar, C. M., 1974, Correlation of the Gallup Sandstone and
associated formations, Upper Cretaceous, eastern San Juan
and Acoma basins, New Mexico: New Mexico Geological Society,
Guidebook 25th field conference,
p. 251-258
O'Sullivan, R. B., and Beikman, H. M., 1963, Geology, structure,
and uranium deposits of
the Shiprock 2"-:&eet,:New Mexico:
U.S. Geological Survey,Misc. Tnv. Map T-345
Robertson, 3. F., 1976, Preliminary geologic map
o f the Casamero
U.S. Geological
Lake quadrangle, McKinley County, New Mexico:
Survey, Open-File Rept. 76-681, map
Robertson, J. F., and Jackson, T. J., 1975;Geologic and structure
. .
. . contous
maps .of hosta
:the Butte. quadrangle;. McKinley :County,
New Mexico: U.S. Geological Survey, Open-File Rept. 75-302,
map
Sabins, F. F., 1963, Anatomy of stratigraphic trap, Bisti field,
New Mexico: ?mer. Association Petroledl Geologists,v. 47,
no. 2, p. 193-228
Stone, W. J., and Mhell, N. H., Basic subsurface data compiled
for hydrogeologic study of San
the 3uan~Basin,northwest
New Mexico: New Mexico Bureauof Minesiand Mineral Resources,
Open-File Rept. 89, 41p.
II
I
Wyant, D. J., and Olson, Annabelle, 1978, Geologic map of the
. .
Albuquerque 2".sheet,. northwestern New.:I$exic_o:U.:g..
Geological Survey, Open-File Rept. 78-476, map
O P E N - F I L E REPORT 105 PLATE 2