DEPARTMENT OF THE INTERIOR
UNITED STATES GEOLOGICAL SURVEY

V /

| Crevass

Srevasses

84°45

PREPARED IN COOPERATION WITH THE
NATIONAL SCIENCE FOUNDATION

55°

54°

52°30'
EXPLANATION

56°

Robbins Nunatak

Owe

Astro Pk

Fs 83°00"
39

MAGNETIC PROFILE — Showing total intensity mag-
netic field of the earth in gammas relative to arbitrary
datum specific to this sheet superimposed on respec-
tive flight path line. Regional field is not removed.
Number corresponds to respective flight path

e
GEOGRAPHIC CONTROL POINT
36
NUMBERED FLIGHT PATH

GAMMAS
100

VERTICAL SCALE FOR MAGNETIC PROFILES

Mean declination 20° E
Mean inclination 70°
Mean total intensity 54,000 gammas

CAMP NEPTS
616 ® Refuge (Nov 1963

+ 658

(Sky 2,

E

°

Y 4967
“i sj Ki Me e >
a ee aN
UU
4

Ps

7690-443) Kamins

Nunatal

pe! Patrick Nunatak
pysoe C/A

Crevasses

60°

GEOPHYSICAL INVESTIGATIONS
MAP GP-889 (SHEET 2 OF 2)

Jo" 30° 75° or

WEDDELL SEA

Belgrano Station
Ellsworth Station,

85°

Pensacola Mts.

500 KILOMETERS

INDEX MAP OF THE PENSACOLA MOUNTAINS REGION
SHOWING SNOW SURFACE ELEVATION. CONTOUR IN-
TERVAL 200 METERS; 100 METER CONTOURS SHOWN
ON ICE SHELF. SHADED AREA IS EXPOSED BEDROCK

67°30! 52°30"

82"

33°

BLACK-
BURN

NUNATAK

THOMAS
HILLS:

85°02 o0"
INDEX OF THE PENSACOLA MOUNTAINS REGION
SHOWING MAP AREA (SHADED), RONNE ICE
SHELF, AND PUBLISHED TOPOGRAPHIC QUAD-

RANGLES.

LOCATION DIAGRAM
_WEST 0° EAST

_ 30°

SNOWFIELD ov)
8
< Dufek Gabbro
oc
a
Disconformity
Siltstone and shale
with coalbeds
Q Gale Mudstone (tillite)
METERS ©
400045 9o
ir
2 Dover Sandstone (quartzite)
a
G Disconformity
3000- & Heiser Sandstone a
$
Elbow Formation 2
e 6 TOPOGRAPHIC MAP LEGEND
c 2 e
i Hiliott Sandstone 5 ice area __ ice-free area
2000 ~| 5 Brown Ridge a Contour lines
3
a /Zonglomerate =
At Unconformity Wsfioits)
BA ens Formation
BIE Gambacorta Formation (approximate)
TORO) 5 Nelson Limestone
27e Uineanebeciity (conjectural)
= aaa
z Cliff or escarpment bream
oo oS Steep slope
o
i Patuxent Formation Small hillocks. 2% ae
© 2yN8 as
ue intersected control stations +327 +321
a
5 i Photogrammetric elevations +2150 2150
PENSACOLA MOUNTAINS COMPOSITE Ice thickness
STRATIGRAPHIC SECTION
From Schmidt and Ford (1969)
Astro control station
Survey control stations
Traverse route with spot height.
Moraine
Glacier
Crevasses
Coastline under ice (definite; indefinite)
Ice shelf seo
Icebergs < sont
Fast or bay ice
209
~ IN Edep Rock®
_._52°
tro a a 50°00"
84°00"

COMPILATION DIAGRAM

Photogrammetric compilation

Isogonic lines compiled from U.S.N.O,
Chart 1706 S, 1965

SCALE 1:250 000

5

10

20 Statute Miles

25 30 Kilometers

60°00!

20

Aircraft support by U.S. Navy

°

Base from U.S. Geological Survey, 1964

___15 Nautical Miles

Polar Stereographic Projection—Standard Parallel 80°14"
CONTOUR INTERVAL 200 METERS—DATUM IS MEAN SEA LEVEL

AEROMAGNETIC PROFILES OF THE SCHMIDT HILLS QUADRANGLE
AND PART OF THE GAMBACORTA PEAK QUADRANGLE, ANTARCTICA

By

John C. Behrendt and John R. Henderson

1973

0.

a |
—1 84°45"
INTERIOR—GEOLOGICAL SURVEY, WASHINGTON, 0.c.—1973—G72478 50°QQ!

Aeromagnetic survey flown at a constant barometric
elevation of 2,100 meters above sea level, 1965

Explanatory pamplet accompanies this map