Ross Sea Region Soil Sites
492000
492
9-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
159.9500
-76.7817
76deg 46.9'S
-159deg -57.0'E
cf. Notes for DESCR below
0
2,100
cf. Notes for GEOLAND below
Xerous, a patchy cover of snow from a recent fall but little thawing
-31
Central mountain
Weathered dolerite bedrock
Nil observed
Nil
SURFACE WEATHERING or |
SURFACE FEATURES |
cf. Notes for SURFWEA below
Nil
492a 0-5cm
201
brown (7.5YR 5/4) granular pebbly gravel
202
loose
203
salt accumulations around some rock particles
204
rock particles angular, moderately to strongly stained and strongly altered
205
distinct boundary,
492a1 2-0cm
101
surface pebbles and granules
102
subrounded to angular and moderately to strongly stained fragmental material from weathering surface boulders,
492b 5-25cm
301
strong brown (7.5YR 5/6) granular pebbly gravel forming a wedge like deposit in a bedrock cleft
302
moderately cohesive
303
rock particles mainly angular, weakly stained and moderately altered
304
sharp boundary, on dolerite bedrock
Yes
Dry frozen
0
5
Descr
Approximately 5km NNE of Mt Brooke, on a broad undulating ridge surface with outcrops of dolerite and Beacon Group sediments; the surface is elevated and |
is dominated by bedrock exposures; the site is a small flattish bench, or old felsenmeer surface, formed by a dolerite sill |
Geoland
Dolerite sills and dykes intrude through Beacon Group sediments; the surface is apparently devoid of till deposits although scattered erratics of hard pitted |
dolerite overly sandstone in places; on this old surface, there is a patchy regolith largely comprising shallow deposits of fragmental bedrock; |
Surfwea
Surface boulders show some rounding and wind abrasion; surface exfoliation is strongly developed on coarser grained dolerite clasts; fine grained dolerite clasts |
are polished, strongly stained and well pitted; where bedrock is at the surface, dolerite shows strong spheroidal weathering with as much as 30cm removed by |
erosion; where fragmental material has accumulated in hollows, a stone pavement is strongly developed |
Soluble Salt |
Concentration |
49200051
61.00
49200001
37.00
49200051
8.50
2.88
11.20
9.60
3.00
0.01
0.01
17.20
2.60
49200001
8.30
0.65
0.71
4.10
0.38
0.01
0.01
4.60
0.04
49200051
40
60
zeolite tr
49200001
50
6
10
15
20
zeolite 5
12-Dec-2005
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