CONTENTS. 



Page. 

 Proceedings of the Semi-Annual Meeting held at Indianapolis August 19, 1890__ 1 



Session of Tuesday, August 19 1 



The Appomattox Formation in the Mississippi Embayment (abstract) ; 



by W J McGee 2 



The Kedonda Phosphate; by C. H. Hitchcock 6 



The Continents and the Deep Seas (abstract) ; by E. W. Claypole 10 



What is the Carboniferous System? (abstract) ; by H. S. Williams 16 



The Nita Crevasse (with figure 1); by L. C. Johnson 20 



An Old Lake Bottom (with figure 2) ; by L. E. Hicks 25 



The Cuyahoga Shale and the Problem of the Ohio Waverly (with plate 1) ; by 



C. L. Herrick 31 



The Structure of a Portion of the Sierra Nevada (with figures 1-13) ; by G. F. 



Becker 49 



Phosphate Deposits of the Island of Navassa (with figure 1) ; by E. V. D'Invil- 



LIERS 75 



4l Last Word with the Huronian (with figures 1-3) ; by Alexander Winchell- 85 

 The Nickel and Copper Deposits of Sudbury District, Canada (with figures 1-3) ; 

 by Robert 3ell. With an Appendix on The Silicified Glass-Breccia of Ver- 

 milion River, Sudbury District (with figure 4) ; by G. H. Wilt jams 125 



The Overthrust Faults of the Southern Appalachians (with plates 2, 3 and figure 



1); by C. Willard Hayes 141 



The Structure of the Blue Ridge near Harper's Ferry (with plates 4, 5) ; by H. 



R. Geiger and Arthur Keith 155 



Note on the Geological Structure of the Selkirk Range (with figure 1) ; by G. M. 



Dawson 165 



Graphic Field Notes for Areal Geology (with plate 6) ; by Bailey Willis 177 



Antiquities from Under Tuolumne Table Mountain in California (with plate 7 



and figure 1) ; by G. F. Becker, 189 



Notes on the Early Cretaceous of California and Oregon ; by G. F. Becker 201 



The Relation of Secular Rock-Disintegration to certain Transitional Crystalline 



Schists (with figures 1-4) ; by Raphael Pumpelly 209 



The Geotectonic and Physiographic Geology of Western Arkansas (with plate 8 



and figures 1-9) ; by Arthur Winslow 225 



Glacial Lakes in Canada; by Warren Upham 243 



(iii) 



