U.S. ANTARCTIC RESEARCH PROGRAM

MOUNT RABOT QUADRANGLE

PREPARED BY THE
ANTARCTIC MAP NO. 1

INSTITUTE OF POLAR STUDIES, OHIO STATE UNIVERSITY
UNDER THE AUSPICES OF THE

NATIONAL SCIENCE FOUNDATION

__ ‘NIMROD GLACIER)

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DEPARTMENT OF THE INTERIOR
UNITED STATES GEOLOGICAL SURVEY

RANGE) 157°
56° . (GEOLOGISTS lide p

QUATER—
NARY

AND
QUATERNARY

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Moraine

Ferrar Dolerite

Tholeiitic diabase sills intruded into Permian and Triassic strata; rare dikes.
Measured sills as thick as 150 m; thicker sills observed. May include rafts of sedi-

TERTIARY (?)

JURASSIC

‘mentary strata

( [> ]

Fremouw Formation
Only lower part of formation present. Cyclic very light-colored quartzose sandstone
and greenish-gray mudstone. Labyrinthodont jawbone fragment found at Graphite

Peak in Plunket Point Quadrangle. About 100m thick.
~

TRIASSIC

th t
pie / Chevdsses
Buckley Formation
Cyclic light-colored sandstone, carbonaceous shale and high-rank high-ash coal. Lower
contact is normally marked by the appearance of white rounded quartz pebbles or

by a coarsening of the sandstone or both. Quartz pebbles occur at higher levels also. * e
Sundetone'ia eularkowte to arhowe lew n formation but voloantc frarmente become Buckley and Fairchild
abundant 100-300 m above base; volcanic sandstone dominates upper part. Logs, Formations, undivided
stems and glossopterid leaves common. Cross-bedding, erosion surfaces and shale

fragments normally present in and near the base of sandstone units. Extensive

laumontization in the voleanic sandstone, Thickness about 750 m

Fairchild Formation
Light reddish-brown massive subarkosic to arkosic sandstone with well-developed ‘Permian satrata:
crossbedding and parting lineation. A few dark shale stringers. Coalified stems divided
and metaquartzite pebbles common in the Queen Elizabeth Range. Rare Ganga- Licaiibiaed
Thickness 150 to 220m

PERMIAN

mopteris.

Beacon Strata

Mackellar Formation.
Light-gray and greenish-gray fine-grained thinly bedded subarkosic sandstone alter-
nating with dark-gray to black finely laminated or thinly bedded shale. Ripple-
drift crosshedding widespread; ripple marks and slump folds at many localities.

Thickness 60 to 140 m

Pagoda Formation
Grayish-green sandy tillite with boulders up to 2 m across, interbedded with tan or
white quartzose sandstone and minor conglomerate, limestone and shale. Locally
basal tillite is very quartzose. Features on grooved surfaces beneath some tillite
beds indicate paleo-ice flow to southeast. Crossbedding common in sandstone. Rare

plant fragments. Thickness 135 to 395 m

net
Q

BETH) w

DISCONFORMITY

Alexandra Formation
White to light-brown medium- to coarse-grained well-sorted quartzose sandstone with
abundant crossbedding. Thin beds of black shale and gray fine-grained limestone
‘in Holland Range. Formation pinches out to west. Thickness 0 to 240 m

A
DEVONIAN(2)

T Evlz,

NONCONFORMITY AND ANGULAR UNCONFORMITY

(MOUNT

ORDOVICIAN

| Hope Granite
| Microcline-biotite granite (Oh) and quartz-diorite (Ohd), porphyritic to equigranular,
| unfoliated and of magmatic origin, intruding pre-Devonian rocks. Includes asso-
| ciated pegmatite and aplite dikes. K-Ar ages mainly Ordovician

|

}

Shackleton Limestone
| Gray, white, cream and black limestone and dolomite, with minor conglomerate,
| quartzite and shale. Tightly folded on north-south axes. Limestone metamorpho-
| sed to marble in Bartrum Plateau area. Overlies Beardmore Group unconformably
‘in Nimrod Glacier area, where it contains Middle Cambrian Archeocyatha and is

at least 8000 m thick

Yasses \ “ANNO

CAMBRIAN

Beardmore Group

Interbedded graywacke, argillite and quartzite, mainly of the Goldie Formation, iso-

clinally folded and thermally metamorphosed to the albite-epidote hornfelsfacies.
Total thickness unknown; at least 6500 m thick north of Nimrod Glacier

2740 ps BY ; Mgt”
Bs Bee : ; OrPiasney 48"
a 4 }

Late Precambrian

PRECAMBRIAN

Nimrod Group
Mica schist, quartzite, biotite- and horndlende-bearing banded gneiss, microcline-augen
gneiss, marble, amphibolite and subordinate cale-silicate schist. Intensely deformed
and regionally metamorphosed to almandine-amphibolite facies (staurolite-alman-
dine subfacies) in Precambrian time. Thickness at least 2500 m

SYMBOLS

Contact

4] Sy
D
Fault, showing dip
Dashed where displacement is due mainly to monocline.
U, upthrown side; D, downthrown side

84°00" 60
165°00" aie
Strike and dip of beds

SCALE 1:250,000
20 Statute Miles

5 ° 5 10
20 25 30 Kilometers
Geology mapped in 1966-68 by Peter J. Barrett,
John Gunner, John F. Lindsay, Ralph J. Baillie,
David H. Elliot, David Johnston, and ~ a
Inclined Vertical
Strike and dip of foliation

\ _—e
a ct)
84°00!
10 15 Nautical Miles
D. Kenyon King

54°00!
Base from U.S. Geological Survey, 1966
5 o 5
Polar Stereographic Projection—Standard Parallel 80°14"
CONTOUR INTERVAL 200 METERS—DATUM IS MEAN SEA LEVEL
Syncline in foliation

—_— — —2000— —_ —
Structure contour
Drawn on base of Beacon Strata. Contour interval 500 meters;
datum is mean sea level

NORTH
>

142°30' bth 172°30'_180°00'
82°00)
Base of measured stratigraphic section

REFERENCES

Barrett, P. J., 1969, Stratigraphy and petrology of the Gunner, J. D., 1969, Petrography of metamorphic rocks
NORTH mainly fluviatile Permian and Triassic Beacon rocks, from the Miller Range, Antarctica: Ohio State Univ.

eeiog se eee Beardmore Glacier area, Antarctica: Ohio State Inst. Polar Studies Rept. No. 32. 135°00"

Univ. Inst. Polar Studies Rept. No. 34. Laird, M. G., Mansergh, G. D., and Chappell, J. M. A., ee On

Grindley, G. W., 1963, The geology of the Queen Alex- in preparation, Geology of the central Nimrod

andra Range, Beardmore Glacier, Ross Dependency, Glacier area, Antarctica: Rept. for N. Z. Geol. Survey.

Antaretica; with notes on the correlation of Gond- Lindsay, J. F., 1969, Stratigraphy and sedimentation

wana sequences: N. Z. Jour. Geol. Geophys., 6 (3), of lower Beacon rocks in the central Transantarctic a

307-347. Mountains, Antarctica: Ohio State Univ. Inst. Polar

Gunn, B. M., and Walcott, R. I., 1962, The geology of the Studies Rept. No. 32.

Mount Markham region, Ross Dependency, Antarc- McDougall, I., and Grindley, G. W., 1965, Potassium-
tica: N. Z. Jour. Geol. Geophys., 5 (3), 407-426. argon dates in micas from the Nimrod-Beardmore-

Axel Heiberg region, Ross Dependency, Antarctica: bead

i Ku

N.Z. Jour. Geol. Geophys., 8 (2), 304-313. gv 51-60/2 G[SEAND, cup dhiaxen

85°00"

+00"
85°00" 150" 165°
135°00" 180°00"

165°00"

SOUTH

154°00' SOUTH

Sheet numbering system based on
International Map of the World

Compiled from U.S.N.0.0. Chart 1706 S, 1960
ISOGONIC LINE DIAGRAM
INDEX TO ADJOINING SHEETS

GLACIER
LOWERY GLACIER

(SEA LEVEL

SEA
LEVEL

SEA LEVEL,
INTERIOR—GEOLOGICAL SURVEY, WASHINGTON, D.c.—1970—G70021

VERTICAL EXAGGERATION X 2.5

RECONNAISSANCE GEOLOGIC MAP OF THE MOUNT RABOT QUADRANGLE,
TRANSANTARCTIC MOUNTAINS, ANTARCTICA

By
Peter J. Barrett, John F. Lindsay, and John Gunner
1970 For sale by U.S. Geological Survey, price $1.00