The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a scale showing the sequence and coordination of the stratigraphic units of the rocks forming the earth’s crust. It reflects the steps in the historical development of the earth’s crust. (See alsoGEOCHRONOLOGY, STRATIGRAPHY.)
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.