Ross Sea Region Soil Sites
493000
493
10-Jan-1983
IBC, GGC
Coombs Hills in the Convoy Range, Trans-antarctic Mountains, between the Odell and Cambridge Glaciers
Soil characterisation
B&W & CS Pro & Lscp
No
160.0330
-76.7850
76deg 47.1'S
-160deg -2.0'E
cf. Notes for DESCR below
3
E
1,950
| Dolerite is extensive on nearby ridges; Beacon Group sandstones outcrop widely on the surface and in places is covered with thin residual doleritic drift and thicker till |
| deposits; wind erosion is severe with large wind ripples formed in places |
Xerous, a patchy cover of snow from a recent fall but little thawing
30
Central mountain
Till derived from dolerite and Beacon Group sediments
Nil observed
Subdued and inactive
| SURFACE WEATHERING or |
| SURFACE FEATURES |
| Well developed desert pavement with ventifacts and few upstanding boulders; dolerite boulders moderately to strongly stained and polished and well pitted; |
| salts occur beneath surface stones |
Nil
493a 2-0cm
101
surface pebbles and granules forming a well developed pavement
102
subrounded and moderately to strongly stained,
493b 0-7cm
201
yellow (10YR 7/6) granular pebbly sand
202
firmly cohesive
203
profuse salts diffused throughout the horizon
204
rock particles mainly subangular, moderately to strongly stained and altered
205
distinct boundary,
493c 7-15cm
301
brownish yellow (10YR 6/6) granular pebbly sand
302
moderately cohesive
303
abundant salts diffused through the horizon
304
rock particles subangular to rounded, moderately to strongly stained and altered
305
sharp boundary,
493d 15-30cm
401
very pale brown (10YR 7/4) sandy pebble and cobble gravel
402
weakly cohesive
403
discrete salt accumulations around many clasts
404
rock particles subrounded to subangular, moderately stained and some strongly altered
405
indistinct boundary,
493e 30-55cm
501
light brown (10YR 6/4) sandy pebble to boulder gravel
502
loose
503
diffuse salt accumulation throughout
504
rock particles subangular to subrounded, moderately stained and moderately altered
505
diffuse boundary,
493f 55-80cm
601
olive yellow (2.5Y 6/6) sandy bouldery gravel
602
loose
603
rock particles mainly subangular and unstained
604
distinct boundary,
493g 80-100cm+
701
light brownish grey (2.5Y 6/2) sandy to silty bouldery gravel
702
loose
703
rock particles subangular and unstained
Yes
a,b,c,d,e,f,g
Dry frozen
100
4
(100> cm)
Descr
| Approximately 5km NE of Mt Brooke and 2km W of the Cambridge Glacier; the surface is part of a complex, broad east-sloping undulating surface formed |
| through retreat of the Cambridge Glacier; in many places the surface is devoid of cover deposits with regolith materials probably being removed by wind |
| erosion; till occurs in patches possibly as a result of differential ice/snow retreat or local ice accumulations; the site is on an older, slightly higher elevation till |
| deposit |
| Soluble Salt |
| Concentration |
49300002
89.00
26.00
10.00
7.00
2.00
1.00
50.00
4.00
0.11
49300003
90.00
49300004
34.00
40.00
21.00
18.00
6.00
4.00
8.00
3.00
0.11
49300001
49300005
28.00
48.00
20.00
14.00
5.00
4.00
6.00
2.00
0.10
49300006
53.00
32.00
22.00
16.00
7.00
6.00
10.00
5.00
0.14
49300007
66.00
24.00
17.00
16.00
8.00
10.00
17.00
10.00
0.12
49300002
8.40
3.17
6.80
17.60
2.60
0.08
0.01
20.40
3.30
49300003
8.50
6.67
20.50
27.50
5.50
0.15
0.01
27.00
22.60
49300004
8.70
6.15
25.00
15.00
7.00
0.10
0.01
16.50
22.10
49300001
49300005
8.80
1.89
5.40
5.00
3.00
0.04
0.01
8.00
3.50
49300006
8.20
1.46
7.90
0.99
1.50
0.03
0.01
3.40
3.90
49300007
8.90
1.08
5.90
0.70
0.88
0.04
0.01
2.90
3.10
49300002
60
20
10
10
49300003
55
35
10
49300004
30
50
5
10
zeolite 5
49300001
49300005
35
35
15
15
49300006
20
50
5
mica-smectite 25
49300007
35
30
20
10
12-Dec-2005
Page 451 of 896
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