Ross Sea Region Soil Sites
362000
362
10-Dec-1972
IBC, GGC
Lower Wright Valley, McMurdo Dry Valley region
Soil weathering examination
USGS 1:50,000 Antarctic Topo. Ser. Lake Bonney Quadrangle
B&W Pro
No
162.3520
-77.5183
77deg 31.1'S
-162deg -21.1'E
On the SE side of the Wright Valley adjacent to the Meserve Glacier; on the surface between the Meserve and the Hart Glaciers; on a steep upper slope on a granitic bedrock |
surface |
30
NW
850
Granite bedrock outcrops on the upper slopes between the Hart & Meserve Glaciers; these surfaces may be above the older Ross Ice Shelf inland advances but may have been |
covered with upper level Alpine glacier ice |
(30o)
Dry soil and site
-24
Coastal Mountain
Thin residual gravelly drift from granite but with some dolerite, over finer drift, on granite bedrock
Nil observed
Nil
SURFACE WEATHERING or |
SURFACE FEATURES |
Bedrock exposures are well rounded with crumbly surfaces; dolerite pebble clasts are subrounded and distinctly stained; surface staining is minor; there is a |
moderately developed pebble and cobble pavement |
Nil at site
362 3-0cm
101
surface cobbles pebbles and granular sand
102
rock particles angular to subrounded and weakly stained,
362a nd
201
light olive brown (2.5Y 5/4) pebbly gravel
202
loose
203
rock particles angular to subangular and weakly stained
204
sharp boundary,
362b 3-6cm
301
olive brown to light olive brown (2.5Y 4/4 - 5/6) sandy gravel
302
weakly cohesive
303
weakly developed vesicular structure
304
rock particles angular to subangular and weakly stained
305
some clasts crumbly
306
distinct boundary,
362c 6-22cm
401
olive brown to light olive brown (2.5Y 4/4 - 5/6) sandy to silty gravel
402
moderately cohesive
403
many distinct salt flecks
404
rock particles angular to subangular and weakly stained
405
some clasts moderately crumbly
406
sharp boundary, on granite bedrock
Yes
a,b,c
Bedrock frozen
22
3
(>22cm)
Soluble Salt |
Concentration |
36200001
33.00
45.10
21.00
19.40
6.60
3.10
2.60
1.80
0.18
36200002
54.00
36.80
17.10
18.50
9.30
6.50
6.90
4.40
0.37
36200003
56.00
35.40
16.30
16.90
8.90
7.30
6.90
7.80
0.35
36200001
8.20
3.70
14.10
4.12
0.50
0.38
7.20
0.15
1.00
36200002
8.60
9.50
43.90
8.12
10.10
1.54
36.30
19.80
36200003
8.40
14.00
65.20
4.12
13.90
2.82
68.60
9.63
0.08
halite
36200001
40
20
15
15
5
36200002
30
25
25
15
5
36200003
50
10
25
10
50
12-Dec-2005
Page 319 of 896
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