Ross Sea Region Soil Sites
317000
317
20-Nov-1972
IBC, GGC
Taylor Dry Valley, McMurdo Dry Valley region near Lake Bonney
Soil sequence weathering examination
USGS 1:50,000 Antarctic Topo. Ser. Lake Bonney Quadrangle
CS Lsc
No
162.4570
-77.7283
77deg 43.7'S
-162deg -27.4'E
cf. Notes for DESCR below
10
NW
360
cf. Notes for GEOLAND below
(10o)
The site is dry with no snow drift or glacier runoff
-23
Central Mountain
Very bouldery granitic till with minor dolerite; there may be some reworked material
Nil observed
Nil
| SURFACE WEATHERING or |
| SURFACE FEATURES |
| Some boulders are up to 2m high and have slight cavernous weathering; boulder rounding, some fracturing and exfoliation are present; there is some slight |
| surface staining |
Nil
317 5-0cm
101
surface boulders and stony gravel
102
angular to subangular and non to weakly stained,
317a 0-5cm
201
light yellowish brown (2.5Y 6/4) bouldery sandy gravel
202
loose
203
rock particles angular to subangular and unstained
204
indistinct boundary, on bouldery sandy gravel
Yes
a
10
2
(>10cm)
Descr
| On the SE side of Lake Bonney, immediately adjacent to and near the snout of the Hughes Glacier; a bouldery surface which forms part of a series (2nd) of |
| moraine loops alongside the Hughes Glacier marking glacial retreat stages; the site is on a shallow, sloping, bouldery moraine loop approximately 40m from the |
| glacier edge |
Geoland
| Alpine glaciers show clear geomorphic evidence of former advance and retreat stages with a series of small closely spaced ridges or terminal moraines over |
| about 100m indicating the former glacier position; weathering increases with distance away from the glacier, suggesting that there may be a considerable age |
| difference between the moraine surfaces; this surface is clearly more weathered than the surface nearer to the glacier |
| Soluble Salt |
| Concentration |
31700001
48.00
29.90
16.40
40.00
5.90
2.80
3.00
1.80
0.20
31700001
8.40
1.70
2.80
1.80
3.70
0.20
7.50
0.40
0.30
31700001
55
25
20
12-Dec-2005
Page 274 of 896
317
