ANCIENT WATER LEVELS OF CH A MPLAIN— HUDSON VALLEYS 251 



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123 Perry, J. B. Supposed Elevation and Depression of the Continent dur- 



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128 Cretaceous Fossils in Deep Wells in Brooklyn. Am. Jour. Sci. 



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129 ■ Shells in Drift in Brooklyn. Am. Jour. Sci. 1848. 5:110-11; 



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135 Safely, R. Discovery of Mastodon at Cohoes, N. Y. Am. Jour. Sci. 



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 U. S. Geol. Sur. 1902. p. 10-17. 



