REFERENCES
1.
2.
3.
Palache, Berman, and Frondel, The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837–1892 (New York, 1946), Vol. 1, p. 612.
4.
F. W. Clarke, The Data of Geochemistry (Washington, 1924).
5.
National Research Council, Report of the Committee on the Measurement of Geological Time, Washington, 1924 to 1954.
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© 1956 American Institute of Physics.
1956
American Institute of Physics
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