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Friday, 21 March 2014

Glacial trough, Sermilik Fjord, East Greenland


There are some splendid glacial features here -- this is a photo of a subsidiary trough or glaciated valley coming out from the mountains into a broader tough (foreground) which is now largely ice-free.  The location -- near Sermilik Fjord in East Greenland.

The black lines show:

1.  The break between the jagged peaks on the skyline, which are fashioned above all else by periglacial processes (marked A) and the ice-moulded rock surfaces below (marked C), which have been dramatically fashioned by glacial erosion at a time when the glacier was thicker and more powerful.

2.  The crest of a splendid ridge of terminal moraine, which runs out into the valley in the foreground, marking the position of a stillstand or protracted position of the glacier front.

The glacier itself (marked B) has now shrunk considerably in size.
In the foreground (marked E) there are much older morainic deposits, now for the most part covered with vegetation, and with a litter of erratic boulders on the ground surface.

If you click on the photos you can enlarge them to inspect all the features in greater detail......  you should be able to click back and forth between the clean photo and the annotated one.

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