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
By: A compilation by M. Grace Wimarth.
Series: U. S. Geological survey. Bulletin; 769
Publisher: Govt. print. off.
Published: 1925
Place of publication: Washington
Language: eng
Number of pages: 138
Subjects: Geology, Stratigraphic.; Geological time.
Notes: Bibliographical references.