The geologic time classification of the United States Geological Survey compared with other classifications accompanied by the original definitions of era, period and epoch terms /

Bibliographic Details

Main Author:	Wilmarth, M. Grace
Corporate Author:	Geological Survey (U.S.)
Format:	Government Document Book
Language:	English
Published:	[Place of publication not identified] : [publisher not identified] ; 1925.
Series:	U.S. Geological Survey bulletin ; 769.