Smithsonian miscellaneous collections . ted States Geological Survey, Vol. 51, 1912,pp. 1-872, pis. 1-104, text figs. 1-76: Cambrian Brachiopoda. 1913. Research in China, Pub. No. 54, Carnegie Institution of Wash- ington, Vol. 3, 1913 (July), pp. 1-276, pis. 1-24, 9 text figs.: The Cambrianfaunas of China. Willis, Bailey. 1907. Research in China, Pub. No. 54, Carnegie Institu-tion of Washington, Vol 2, 1907 (July), pp. i-v, 1-133. pls. 1-8: System-atic geology. Blackwelder, Eliot and Sargent, R. H. 1907. Research in China, Pub. No. 54, Carnegie Institution of Washington, Vol. i, 1907 (Apr.),pt
Smithsonian miscellaneous collections . ted States Geological Survey, Vol. 51, 1912,pp. 1-872, pis. 1-104, text figs. 1-76: Cambrian Brachiopoda. 1913. Research in China, Pub. No. 54, Carnegie Institution of Wash- ington, Vol. 3, 1913 (July), pp. 1-276, pis. 1-24, 9 text figs.: The Cambrianfaunas of China. Willis, Bailey. 1907. Research in China, Pub. No. 54, Carnegie Institu-tion of Washington, Vol 2, 1907 (July), pp. i-v, 1-133. pls. 1-8: System-atic geology. Blackwelder, Eliot and Sargent, R. H. 1907. Research in China, Pub. No. 54, Carnegie Institution of Washington, Vol. i, 1907 (Apr.),pt. I, pp. 1-353, figs. 1-65: Descriptive topography and geology. Woodward, Henry. 1905. Geological Magazine of London, new sen, , Vol. 2. 1905. pp. 211-215, 251-255, pi. 13: On a collection of trilobitesfrom the Upper Cambrian of Shan-tung, North China. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 64, NUMBER 2 CAMBRIANGEOLOGY AND PALEONTOLOGY III No. 2.—FRE-CAMRRIAN ALGONKIAN ALGAL FLORA (With Plates 4 to 23) BYCHARLES D. WALCOTT. (Publication 2271] CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITLTION lULY 22, 1914 ^()i £orJ) Qpafftmore (prcee BALTIMOHK, MD.; CAMBRIAN GEOLOGY AND PALEONTOLOGY III No. 2.—PRE-CAMBRIAN ALGONKIAN ALGAL FLORA By CHARLES D. WALCOTT (With Plates 4 to 23) CONTENTS PAGE Introduction 79 Acknowledgments 79 Continental conditions during Algonkian time 80 Diastrophism 82 Narrowing of the Cordilleran sea 82 Coastal deposits 83 Cambrian basal unconformity 83 Climate 83 Origin of Algonkian limestones 84 Recent calcareous deposits 85 Algonkian lakes 89 Deposition of limestone through the agency of alg?e 89 Bacterial deposits , 92 Application 94 Magnesian limestones 95 Definition of magnesian limestone and dolomite 96 Magnesian limestone 96 Dolomite 96 The biotic record 97 The fauna 97 Algal deposits 98 Stratigraphic position 99 Section of Belt Series 99 The algal flora 100 Comparison of recent Blue-green alg;e deposits and those of Algon-kian ti
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