How old are fossils?

Name: How old are fossils?
Author: Roy, Sharat Kumar

Roy, Sharat Kumar

Fossils; Paleontology

+-----------------+-------+-------+--------------------
                |  Silurian       |  390  |  460  |
                +-----------------+-------+-------+ AGE OF HIGHER
                |  Ordovician     |  480  |  590  |   SHELLED
                +-----------------+-------+-------+ INVERTEBRATES
                |  Cambrian       |  550  |  700  |
    ------------+-----------------+-------+-------+--------------------
                |                 |               |
    PROTEROZOIC |                 |      925      | AGE OF PRIMITIVE
                |                 |               |  INVERTEBRATES
    ------------+  Systematic     +---------------+--------------------
                | classification  | LONG EROSIONAL INTERVAL
    ------------+   variable      +---------------+--------------------
                |                 |               | DAWN OF UNICELLULAR
    ARCHEOZOIC  |                 |     1500      |  LIFE, ALGAL FORMS
                |                 |               |      REPORTED
    ------------+-----------------+---------------+--------------------




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.

[Illustration: 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

Public-domain text, read in full here on John Shaqi.

How old are fossils?

No reviews yet