Rate of Recession of Niagara Falls
iiiiiiliiiiiii* RATE OF RECESSION OF NIAGARA FALLS BY K. G. GILBERT SpCl T27 N8 G46 ^^^^ mivEns,^^VNrv 186084 ^' Descriptive Geology, Bulletin No. 306 Series i ^"®^\P, Geography, 54 DEPARTMENT OF THE IXTERIOR UNITED STATES GEOLOGICAL SURVEY CHARLES D. WALCOTT, Director RATE OF RECESSION OF NIAGARA FAILS G-. K. GILBERT ACCOMPANIED BY A REPORT ON THE SURVEY OF THE CREST -W. CARVEL H^ILiL WASHINGTON GOVERNMENT PRINTING OFFICE 1907 / ^' Descriptive Geology, 109 Bulletin No. «?AriP=! ^®™n F, Geography, 54 DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY CHARLES D. WALCOTT, Directok RATE (IF RECESSION OF NIAGARA FALLS G^. K. OILBERT ACCOMPANIED BY A REPORT ON THE SURVEY OF THE CREST -S\r. CARVEL H^LL WASHINGTON GOVERNMENT PRINTING OFFIC! 1907 CONTENTS. Introduction 5 The Horseshoe Fall 13 The American Fall 17 The map of 1842 23 Summary and conclusion 25 Report of survey of crest line of Niagara Falls, by W. Carvel Hall 26 LLUSTRATIOXS. Page. Plate I. Horseshoe Fall, 1886 5 11. Map, crest lines of Niagara Falls in 1842, 1875, 1886. 189(). and 1905 10 HI. Sketch of Horseshoe Fall, 1827 15 rV^ Photograph of Horseshoe Fall, 1895 15 V. Sketch of American Fall from Goat Island, 1827. 17 VI. Photograph of American Fall from Goat Island, 1895 17 VII. Sketch of American Fall from Prospect Point, 1827 19 VIII. Photograph of American Fall fi-ora Prospect Point, 1895 19 IX. American Fall, 1854 or 1855, from daguerreotype 20 X. Eastern part of Horseshoe Fall, about 1885 22 XI. American Fall, about 1885 22 Fig. 1. Diagrammatic profile of Horseshoe Fall 5 2.
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