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François Matthes and the Marks of Time: Yosemite and the High Sierra by François E. Matthes (1962)


APPENDIX

Major Divisions of Geologic Time in Use by the U.S. Geological Survey

EraPeriod or
System
Epoch or
Series
Approx. no. of
million years
ago.1
Approx. length
in millions of
years1
Cenozoic     Quaternary     Recent
Pleistocene    
0–11
TertiaryPliocene1–1211
Miocene12–2816
Oligocene28–4012
Eocene
Paleocene
40–6020
MesozoicCretaceous60–13070
Jurassic130–15525
Triassic155–18530
PaleozoicPermian185–21025
Pennsylvanian
(Upper Carboniferous)
210–235225
Mississippian
(Lower Carboniferous)
235–265230
Devonian265–32055
Silurian320–36040
Ordovician360–44080
Cambrian440–52080
ProterozoicPre-Cambrian520–2100+1600+

1Report of the National Research Council, Committee on the Measurement of Geologic Time, 1949–50.

2Estimate of J. P. Marble, Chairman of Committee on Measurement of Geologic Time, March 17, 1954.


SOME OTHER PUBLICATIONS ON THE SIERRA NEVADA BY FRANÇOIS E. MATTHES

Superintendent of Documents, Government Printing Office. Washington 25, D.C.:

The Geologic History of Yosemite Valley. Professional Paper 160, U. S. Geological Survey. 1930.
Reconnaissance of the geomorphology and glacial geology of the San Joaquin Basin, Sierra Nevada. California. Professional Paper 329, U.S. Geological Survey, 1960.*
Glacial reconnaissance of Sequoia National Park, California. (To be published by the U. S. Geological Survey.)*

The University of California Press. Berkeley 4, California:

Sequoia National Park: a geological album. 1950.*
The Incomparable Valley: a geologic interpretation of the Yosemite. 1950.*
* Posthumous works, edited by Fritiof Fryxell.


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