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. A compilation by M. Grace Wimarth.

By: Material type: TextTextSeries: U. S. Geological survey. Bulletin ; 769Publication details: Washington, Govt. print. off., 1925.Description: vi, 138 p. pl. (fold. tab.) tables. 23 cmSubject(s): LOC classification:
  • QE75 .B9 no. 769
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