Cenotypal Rocks
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Cenotypal Rocks
magmatic rocks that preserve a freshappearance despite their age. Cenotypal rocks are distinguished from paleotypal rocks, which are much decayed and there fore appear ancient. This terminology arose in the second half of the19th century (W. C. Brògger, F. J. Levinson-Lessing) in connection with the refutation of the previously held but mistaken idea that fresh-looking cenotypal rocks are young and decayed(paleotypal) rocks are ancient.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.