CONTENTS , IX 



Page 



Remarkable deformation of the Algonquin Beach [abstract and discus- 

 sion] ; by Frank Leverett 697 



Pleistocene succession in Wisconsin [abstract] ; by Samuel Weidman. 697 



Iowan drift [abstract and discussion] ; by Frank Leverett ; . . . . 698 



Canyon and delta of the Copper River in Alaska [abstract] ; by Law- 

 rence Martin 699 



Submarine chamsecyparis bog at Woods Hole, Massachusetts, and its 

 relation to the problem of coastal subsidence [abstract] ; by Doug- 

 las W. Johnson 699 



Contra-imposed shorelines [abstract] ; by Charles H. Clapp 700 



Peat deposit of geological interest near New Haven, Connecticut [ab- 

 stract] ; by Charles A. Davis 700 



Early Paleozoic physiography of the southern Adirondacks [abstract] ; 

 by William J. Miller 701 



Level of maximum precipitation as a factor in the glaciation of Mount 

 Rainier [abstract] ; by F. E. Matthes 701 



Characters of the older sections of the Niagara Gorge and their corre- 

 lation with Great Lakes history [abstract] ; by Frank B. Taylor. . 702 



Microstructure of titaniferous magnetites [abstract] ; by Joseph T. 

 Singewald, Jr 704 



Origin of granites as well as metacrystals by selective solution — a re- 

 cantation [abstract and discussion] ; by Alfred C. Lane 704 



Pre-Cambrian structure of the northern Black Hills, South Dakota, 

 and its bearing on the Homestake ore body [discussion] ; by Sidney 

 Paige ' 704 



Petroleum fields of northeastern Mexico between the Tamesi and Tux- 



- pan rivers [discussion] ; by I. C. White 706 



Inadequacy of the sapropelic hypothesis of the origin of coal [ab- 



- stract] ; by Edward C. Jeffrey 706 



Water and volcanic activity [discussion] ; by Arthur L. Day and 



; E. S. Shepard 707 



Geologic section of the Panama Canal zone [abstract] ; by Donald F. 

 MacDonald 707 



Geological light from the Catskill Aqueduct [discussion] ; by Charles 

 P. Berkey 711 



A classification of marine deposits [discussion] ; by A. W. Grabau 711 



Postglacial earth movements about Lake Ontario and the Saint Law- 

 rence Valley [discussion] ; by J. W. Spencer 714 



Nature of the substance known as mother of coal and its relation to 

 the process of coal formation [abstract] ; by Edward C. Jeffrey . . . 715 



Pottsville-Allegheny boundary in the Interior Province [abstract] ! by 

 u David White "1° 



Origin of the hard rock phosphate deposits of Florida [abstract I ; by 

 E. H. Sellards 71G 



Alteration processes and products within the Grenville limestone [ab- 

 stract j ; by Alexis A. Julien ~^~ 



New light on the Keweenawan fault [abstract 1 ; by A. 0. Lank 718 



Glacial erosion in the Genesee Valley system and its bearing on the 

 Tertiary drainage problem of eastern North America [abstract and 

 discussion] ; by A. W. Grabau W 



