457

Site number:

457

Authors:

IBC, GGC

Date recorded:

1979/12/12

Reason Sampled:

Soil weathering examination

Description:

The Enterprise Hills region of the Ellsworth Mountains; north of Parrish Peak near the head of a small valley to the south of Seal Glacier; on a subdued moraine ridge at a lower elevation

Altitude:

925 m

Aspect:

N

Slope:

7 °

Climate

Soil climate zone:

Inland/Coastal Mountain

Estimated mean annual temperature:

-20 °C

Frozen ground depth:

40 > cm

Frozen type:

Dry frozen

Frozen comment:

>40cm

Geology

Geological setting:

The Ellsworth Mountains comprise a thick sequence of folded metasedimentary rocks comprising limestones, conglomerates and quartzites dating to Precambrian; the West Antarctic Ice Sheet is believed to have fluctuated greatly in response to global sea level changes and evidence of these fluctuations should be present in the tills and soil weathering record; at this site, the till represents deposits of the Union Glacier at a an intermediate level

Patterned ground:

Weakly expressed patterned ground nets

Surface weathering or surface features:

Some rounding of surface cobbles and boulders; a weakly developed pebble pavement; boulders more strongly stained on upper surfaces than lower; a few scattered salts beneath some surface stones

Soil

Soil parent material:

Till from quartzitic metasedimentary rocks, some greenish, blackish and brown

Previous disturbance:

Nil

Soil weathering stage:

3 (Campbell & Claridge 1975)

Soil moisture status:

Scattered snow patches; this site is dry with no indications of snow thawing

Biological activity:

Nil observed