Fred Duquenne
Glacial P o t h o l e
Glacial potholes are formed at the bottom of glaciers through erosion caused by sand and gravel in melt-water; melt-water seeps through crevasses in the glacier at the bottom forming whirlpools under very high pressure, leading to erosion of underlying rocks.
This one - about six feet (1.8 m ) - is sixty feet deep ,noted and recorded by excavation of debris in the pothole a half century ago .
Image is from a recent revisit of a site I photographed three years ago . ( See album )
Glacial P o t h o l e
Glacial potholes are formed at the bottom of glaciers through erosion caused by sand and gravel in melt-water; melt-water seeps through crevasses in the glacier at the bottom forming whirlpools under very high pressure, leading to erosion of underlying rocks.
This one - about six feet (1.8 m ) - is sixty feet deep ,noted and recorded by excavation of debris in the pothole a half century ago .
Image is from a recent revisit of a site I photographed three years ago . ( See album )