Geology Reference
In-Depth Information
11
PERIGLACIAL LANDSCAPES
Frozen ground without an icy cover bears an assortment of odd landforms. This chapter covers:
ice in frosty landscapes
frost, snow, water, and wind action
pingos, palsas, and other periglacial landforms
humans in periglacial environments
A window on the periglacial world
In 1928, the airship
Graf Zeppelin
flew over the Arctic to reveal:
the truly bizarre landscape of the polar world. In some areas there were flat plains stretching from horizon to horizon that were dotted
with innumerable and inexplicable lakes. In other regions, linear gashes up to a mile or more long intersected to form giant polygonal
networks. This bird's-eye view confirmed what were then only incidental surface impressions that unglaciated polar environments were
very unusual.
(Butzer 1976, 336)
PERIGLACIAL ENVIRONMENTS
Stockholm to describe climatic and geomorphic condi-
tions in areas peripheral to Pleistocene ice sheets and
glaciers. This periglacial zone covered tundra regions,
extending as far south as the latitudinal tree-line. In mod-
ern usage, periglacial refers to a wider range of cold but
non-glacial conditions, regardless of their proximity to a
glacier. It includes regions at high latitudes and below
The term 'periglacial' was first used by Polish geomor-
phologist Walery von Lozinzki in 1909 to describe frost
weathering conditions in the Carpathian Mountains of
Central Europe. In 1910, the idea of a 'periglacial zone'
was established at the Eleventh Geological Congress in
