Mistake Crag
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Mistake Crag () is a slightly bowed crag in
Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. ...
, extending north from Cinder Spur and rising to about above the presently unnamed
glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...
on its west side. The name is derived from the mistaken belief that Cinder Spur was mainly composed of cinders from the supposed adjacent volcanic vent, now proved by snow retreat to be a
cirque A (; from the Latin word ) is an amphitheatre-like valley formed by Glacier#Erosion, glacial erosion. Alternative names for this landform are corrie (from , meaning a pot or cauldron) and ; ). A cirque may also be a similarly shaped landform a ...
. The crag is really formed of
sedimentary rock Sedimentary rocks are types of rock (geology), rock formed by the cementation (geology), cementation of sediments—i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)—that have been accumulated or de ...
, whereas Cinder Spur is a dyke.


References

Cliffs of the South Shetland Islands {{KingGeorgeIslandAQ-geo-stub