BIBLIOGRAPHY
Barrell, J.—Rhythms and Measurements of Geological Time.
Bull. Geol. Soc. Am., Vol. 28, 1917, pp. 745-904.
Becker, Geo. E.—The Age of the Earth.
Smithsonian Misc. Coll., LVI., No. 6, 1910.
Chamberlain, T. C.—Diastrophism and the Formative Processes, XIII.
The Time over which the Ingathering of the Planetesimals was Spread.
Jour. Geol., Vol. XXVIII, 1920, pp. 675-81.
Harker, A.—Geology in relation to the exact
sciences, with an excursus on geological time.
Nature, Vol. 95, 1915, pp. 105-109.
Holmes, A.—The Age of the Earth.
Harper and Bros., London and New York, 1913.
Joly, J.—Radioactivity and Geology.
Van Nostrand, N. Y., 1909;
An Estimate of the Geological Age of the Earth.
Trans. Roy. Soc. Dublin, VII. 1899, pp. 23-66;
The Age of the Earth. Phil. Mag., 6th ser.,
Vol. XXII, 1911, pp. 359-80.
Sollas, W. J.—Presidential Address.
Quart. Journ. Geol. Soc., Vol. 65, 1909, pp. cxii;
Proc. Geol. Soc. of London, Sess. 1908-9, pp. i-cxxii.
Walcott, C. D.—Geologic Time, as indicated
by the sedimentary rocks of North America.
Smithsonian Rep. 1893, pp. 301-334;
Jour. Geol. Vol. III, 1893, pp. 639-674.
LEAFLET 9.PLATE IV.
EVOLUTION OF FISH TO MAMMAL-LIKE REPTILE.
1, FISH. 2, AMPHIBIAN. 3, REPTILE. 4, MAMMAL-LIKE REPTILE.
(Figs. 1, 2, after Klaatsch, 3, based on Williston, 4, based on Gregory).
Drawings by Sharat K. Roy.
PRINTED IN THE UNITED STATES OF AMERICA
BY FIELD MUSEUM PRESS