Approx 5km NE of Bastion Hill; a sloping bouldery till surface with large 2-4m cavernously weathered granite boulders; soil sample collected from fine material from a cavern in a granite boulder
Altitude:
775 m
Aspect:
N
Slope:
5 °
Location Data
Observer
IBC
GPS
No
Latitude Longitude DMS
79° 48' S 158° 29' E
Latitude Longitude DD
-79.800 158.483
Latitude longitude precision DD
0.008 0.008
Locality
Victoria Land, Trans-antarctic Mountains; at the southern end of the Cook Mountains in the Brown Hills region of the Darwin Glacier
Survey
USGS 1:250,000 1963; Carlyon Glacier ST 57-60/13*
Climate
Soil climate zone:
Coastal mountain
Estimated mean annual temperature:
-23
°C
Frozen ground depth:
0 cm
Frozen type:
Frozen comment:
Geology
Geological setting:
Granites and granodiorite rocks from the Granite Harbour Intrusives are extensive and form the dominant component of the tills; Ferrar Dolerite which occurs in sills within the basement rocks occurs in lesser amounts; till deposited from retreating local glaciers is less extensive on lower slopes
Patterned ground:
Surface weathering or surface features:
very bouldery surface; granite boulders (2-4m) subrounded with moderately stained surfaces and well developed cavernous weathering; occasional dolerite boulders, moderately stained
pale brown (10YR 6/3) pebbly granular sand; loose; rock particles mainly subangular and unstained but a few with weak surface staining; abrupt boundary,
100b
3
–
8
cm
light grey (2.5Y 7/2) pebbly granular sand; weakly cohesive; many fine crystalline salts; rock particles from disintegrating granite subangular and unstained, on crumbling granite