Approximately .5km W of Battleship Promontory; on a lower altitude moraine surface a gently sloping moraine ridge above a strongly sloping surface
Altitude:
875 m
Aspect:
NW
Slope:
3 °
Location Data
Observer
IBC
GGC
GPS
No
Latitude Longitude DMS
76° 53.9' S 160° 59.4' E
76° 54' S 160° 56' E
Latitude Longitude DD
-76.8983 160.9900
-76.900 160.933
Latitude longitude precision DD
0.0008 0.0008
0.008 0.008
Locality
Convoy Range, Trans-antarctic Mountains, Alatna valley
Survey
Climate
Soil climate zone:
Central mountain
Estimated mean annual temperature:
-28
°C
Frozen ground depth:
50 > cm
Frozen type:
Dry frozen
Frozen comment:
>50cm
Geology
Geological setting:
Ferrar Dolerite and Beacon Sandstone are the local rocks; the till includes some granite (about 5%) and other basement rock; these are not found up-valley so must have originated from the east
Patterned ground:
Weakly developed to non active
Surface weathering or surface features:
A moderately to strongly developed pavement; occasional upstanding boulders; moderately to strongly developed ventiforms; clasts moderately stained, especially on upper surfaces and finer grained clasts distinctly polished; salts beneath some surface clasts; pitting on fine grained clasts
Soil
Soil parent material:
Dolerite, sandstone and granite stony till; granite is more abundant than at site 512
A north facing face with no snow patches; no soil moistening evident
Biological activity:
Nil observed
Profile Description
Horizon
Depth
Description
513a
-3
–
0
cm
surface sandy cobbly gravel with some small boulders; a well developed pavement; moderately ventiform with distinct up wind abrasion; clasts subrounded and moderately stained,
513b
0
–
6
cm
strong brown (7.5YR 5/6) sandy gravel; weakly cohesive; weakly developed vesicular structure; some clasts partly disggregated; salts accumulated around disaggregating clasts; larger rock particles subangular weakly stained and some weakly altered; smaller particles rounded to subrounded; distinct boundary,
513c
6
–
20
cm
dark brown (7.5YR 4/4) sandy gravel; moderately to firmly cohesive and salt cemented; abundant salts; some ghosts and some partly disaggregated clasts; larger rock particles mainly angular to subangular and unstained; smaller particles rounded to subrounded; distinct boundary,
513d
20
–
35
cm
dark brown (7.5YR 4/4) sandy gravel; weakly cohesive; scattered salt flecks with some on rock faces; larger rock particles angular to subangular with some weakly stained, smaller particles rounded to subrounded; distinct boundary,
513e
35
–
50
cm
yellowish brown (10YR 5/4) sandy gravel; loose; a few fine salt flecks; larger rock particles angular to subangular and unstained; smaller particles subrounded; sharp boundary, on ice-cemented ground