GEOLOGY SYSTEM

Domain	Definition
Mining	A. The formal chronostratigraphic unit of rank next lower than "erathem" and above "series". Rocks encompassed by a system represent a time span and an episode of Earth history sufficiently great to serve as a worldwide reference unit. The temporal equivalent of a system is a "period." The system is the fundamental unit of chronostratigraphic classification of Phanerozoic rocks, extended from a type area or region and correlated mainly by its fossil content. System boundaries either have been ratified by the International Union of Geological Sciences or are under review by a working group of the International Commission on Stratigraphy. The Proterozoic systems are related to geologic events with geochronologic boundaries established by the Subcommission on Precambrian Stratigraphy. b. Some systems initially established in Europe were later divided or grouped elsewhere into units ranked as systems, but these are moreappropriately known as "subsystems" or "supersystems". (references)
Source: compiled by the editor from various references; see credits.

Anagrams: GEOLOGY SYSTEM

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "e-e-g-g-l-m-o-o-s-s-t-y-y"
	-4 letters: etymology.
	-5 letters: gemology, glosseme, lysosome, myosotes.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.