Page:Walcott Cambrian Geology and Paleontology II.djvu/37

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SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOLUME 57, NUMBER 1


CAMBRIAN
GEOLOGY AND PALEONTOLOGY

II


ABRUPT APPEARANCE OF THE CAMBRIAN FAUNA ON THE NORTH AMERICAN CONTINENT

With One Map


BY
CHARLES D. WALCOTT



(Publication 1940)


CITY OF WASHINGTON
PUBLISHED BY THE SMITHSONIAN INSTITUTION
AUGUST 18, 1910