Earth Pyramids
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Earth Pyramids
narrow conical formations with elevations up to 10-15 m, formed by boulder-clay glacial deposits (morraine). They are usually crowned by a large boulder or block; they occur when unsorted morraine masses are eroded by atmospheric precipitation. The large boulders on top of the earth pyramids protect the morraine mass underneath from destruction.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.