Blockfields are large expanses of coarse
and angular rock rubble. They typically occur on
plateaux in mid and high latitudes that escaped
erosion by warm-based ice during the Pleistocene,
as well as polar deserts and semi-deserts. Steeper
fields, up to 35°, are called blockstreams. An
example is the ‘stone runs’ of the Falkland
Islands. Some blockfields, such as those in the
Cairngorms, Scotland, are relict features that
predate the last advance of sheet.
Blockfields are large expanses of coarseand angular rock rubble. They typically occur onplateaux in mid and high latitudes that escapederosion by warm-based ice during the Pleistocene,as well as polar deserts and semi-deserts. Steeperfields, up to 35°, are called blockstreams. Anexample is the ‘stone runs’ of the FalklandIslands. Some blockfields, such as those in theCairngorms, Scotland, are relict features thatpredate the last advance of sheet.
การแปล กรุณารอสักครู่..
