The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
boulder clay, or sandy loam, sand and clay rocks with detritus haphazardly distributed in them. Glacial till is usually found among glacial deposits, but sometimes it is of solifluctional or mud-torrential origin.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.