Approximately 700 m north of site 805; approximately 8.25 km WSW of Larsen Crag, on the south west side of Greenville Valley, on a descending valley floor surface formed below a higher terrace like surface; the surface is slightly undulating with minor topography formed from patterned ground features
Altitude:
1175 m
Aspect:
Nil
Slope:
0 °
Location Data
Observer
GGC
IBC
GPS
No
Latitude Longitude DMS
76° 46.6' S 160° 44.5' E
76° 45.1' S 160° 49.1' E
Latitude Longitude DD
-76.7767 160.742
-76.7517 160.8180
Latitude longitude precision DD
0.0008 0.004
0.0008 0.0008
Locality
Greenville Valley, southwest of Northwind Glacier in the Convoy Range
Survey
not recorded
Climate
Soil climate zone:
Central Mountain
Site temperature profile
Depth (cm)
Soil temp (°C)
Notes
1
-8
5
-7
10
-6
15
-7
20
-7
28
-7
Estimated mean annual temperature:
-27
°C
Frozen ground depth:
0 cm
Frozen type:
Hard ice-cemented
Frozen comment:
ice-cemented at 28cm
Geology
Geological setting:
Greenville Valley comprises mainly dolerite with some minor sedimentary rocks (Weller Coal Measures) and has been formed by ancient ice over riding the Convoy Range from the west; valley head-wall deposits occur mainly around the south-western side of the valley and represent alpine glacial deposits; towards the western end of Greenville Valley, the surface is a dolerite platform with a thin irregular till cover with occasional sandstone and decomposed granite erratics; on the lower surfaces which slope and drain towards the north-east, tills deposits are more extensive, have more strongly developed patterned ground and have a greater abundance of pink granite erratics; at this site sandstone, presumably from outcrops further down valley accounts for about 2% of the surface clasts
Patterned ground:
weakly developed 4-8m nets with 20cm troughs
Surface weathering or surface features:
Dolerite clasts are moderately to strongly oxidised, sub rounded to sub angular and moderately abraded; some cyclic staining and exfoliation of oxidised surfaces; coarse grained clasts strongly disaggregated; some salts beneath surface stones
Soil
Soil parent material:
Doleritic till with scattered granite and sandstone over ice-cemented ground
Xerous to sub xerous; several snowfalls and a recent fall within 4 days; most snow cover removed by ablation but some soil moistening in the upper few centimetres; no liquid flows
Biological activity:
Occasional yellow and green lichen in rock fissures and some patches of black lichen
Profile Description
Horizon
Depth
Description
808a
-2 – 0 cm
surface cobble and boulders; well developed pavement; clasts mainly subrounded to rounded and moderately to strongly stained; medium pitting and weakly ventiform; salts beneath many surface stones,
808b
0 – 3 cm
dark reddish brown (5YR 3/4) cobbly gravelly sand; very firm and frosted; moderately developed vesicular structure; rock particles subangular to subrounded, strongly stained and strongly altered; distinct boundary,
808c
3 – 10 cm
dark reddish brown (5YR 3/4) pebbly to cobbly gravel; firm and & d partly frozen; diffuse salts but some large very salty patches (sampled separately); rock particles mainly angular, weakly stained with smaller particles strongly altered; distinct boundary,
808e
10 – 28 cm
brown to dark brown (7.5YR 4/4) sandy bouldery to pebbly gravel; moderately cohesive; rock particles mainly unstained and angular comprising some fragmented boulder material; many smaller particles strongly altered; sharp boundary,
808f
28 – 44 cm
pale brown (10YR 6/3) ice-cemented gravel (drill core); rock particles subangular to subrounded with some moderately altered,
808g
44 – 57 cm
light gray (10YR 7/2) ice-cemented gravel (drill core); rock particles subangular with some moderately altered,
808h
57 – 74 cm
light gray (10YR 7/2) ice-cemented gravel (drill core); rock particles subangular with some moderately altered;
808i
74 – 90 cm
light gray (10YR 7/2) ice-cemented gravel (drill core); rock particles subangular; some moderately altered,