Ross Sea Region Soil Sites
915000
915
14-Dec-1999
IBC
Near Lake Hoare, Taylor Valley, McMurdo Dry Valley region, Transantarctic Mountains
Long Term Ecological Research (nematode experimental area) site investigation of soil properties; this site |
is adjacent to LTER 9 and was on a 'moist' gully floor surface |
Lake Bonney Quadrangle, Antarctic 1:50,000 Topographic Series, USGS 1975
CS Lscp
Yes
162.8760
-77.6342
77deg 38.05'S
-162deg -52.56'E
Adjacent to the westernmost plot, approximately 225m from Lake Hoare; the site is on the floor of an elongated depression between moraine ridges about 15m to the east of the |
LTM Algae plot; the surface is smooth with a pebble pavement |
2
North
75
cf. Notes for GEOLAND below
Xerous to subxerous; the soils in the depression are moist to the surface; the increased |
moisture content may partly be a function on higher salinity |
-20
Coastal mountain;
Pebbly sandy gravel
Nil observed at site, nematodes present in adjacent soil; some green algae beneath marble clasts in the general area
Nil
SURFACE WEATHERING or |
SURFACE FEATURES |
A well developed pebble pavement with some surface salt precipitations
Site probably disturbed by foot traffic activity during biological research activities near the site
915a 0-2cm
101
light olive grey (5Y 6/2) sandy pebble gravel
102
loose
103
moist
104
a few fine surface salt precipitations
105
diffuse boundary
106
915b 2-10m
201
light olive grey (5Y 6/2) sandy pebble gravel
202
weakly cohesive
203
moist
204
diffuse boundary,
915c 10-28cm
301
light olive grey (5Y 6/2) sandy pebble gravel
302
loose
303
moist weakly cohesive
304
diffuse boundary,
915d 28-30cm
401
light olive grey (5Y 6/2) sandy pebble gravel
402
loose
403
moist weakly cohesive
404
diffuse boundary,
No
Nd
0
1
(Nd)
Geoland
The deposit is unweathered Ross I till, possibly derived from the Canada Glacier but almost certainly with an up-valley influence because of the presence of |
marble clasts from basement rocks; the tills may be fluvio-glacial owing to complex depositional ice-marginal processes as the sand % generally increases |
downwards while there are noticeably more coarse clasts at the surface; depressions typically have sandy pebble deposits |
Soluble Salt |
Concentration |
91500001
915a
0-2cm
0
2
1.68
81.00
5.48
1,237.00
none
91500002
915b
2-10cm
2
10
1.51
83.00
5.94
78.40
none
91500003
915c
10-28cm
10
28
1.61
81.00
5.76
51.60
none
91500004
915d
28-30cm
28
30
1.55
80.00
6.93
56.30
none
12-Dec-2005
Page 890 of 896
915