CONTENTS V 



Page 

 Types of Rocky Mountain structure in southeastern Idaho 



[abstract and discussion] ; by George R. Mansfield 126 



Age of the scarp-producing faults of the Great Basin [ab- 

 stract] ; by George D. Louderback 127 



Fault system at the southern end of the Sierra Nevada, Cali- 

 fornia [abstract] ; by J. P. Buwalda 127 



Extent and thickness of the Labrador ice-sheet [abstract] ; 



by A. P. Coleman 128 



Drumlins at Lake Placid [abstract] ; by Warren Upham 128 



Extremes of mountain-glacier erosion [abstract] ; by William 



Herbert Hobbs 130 



Dispersion of stones in the drift, in New Hampshire [ab- 

 stract] ; by James W. Goldthwait 130 



Late Pleistocene changes of level in northern Manitoba, 



Canada [abstract] ; by W. A. Johnson 131 



Glacial history of the Columbia River in the Big Bend coun- 

 try [title] ; by Oscar E. Meinzer 131 



Certain aspects of glacial erosion in Alaska [abstract] ; by 



W. O. Crosby 132 



Further discussion of the Aftonian gravels and their relation 

 to the drift-sheets in the region about Afton Junction and 



Thayer, Iowa [abstract] ; by George F. Kay 132 



Sectional sessions 133 



The Windrow formation, an upland gravel formation of the 

 driftless and adjacent areas of the upper Mississippi Valley 



[abstract] ; by E. T. Thwaites and W. H. Twenhofel 133 



Correlation of the Cenozoic formation of the Great Basin ; by 



John C. Merriam 133 



Concerning certain diverse interpretations of Pleistocene in the 



Dakotas [abstract] ; by James E. Todd 134 



Tertiary formations of Porto Rico [abstract] ; by Bela Hub- 

 bard 135 



Type section of the Morrison formation [abstract and discus- 

 sion] ; by Willis T. Lee 135 



Further studies on the Jurassic of Cuba [abstract] ; by Mar- 



jorie O'Connell 136 



Middle Ordovician of Virginia and Tennessee [abstract] ; by 



Percy E. Raymond 137 



Notes on the Oriskany and Helderberg in Virginia [abstract] ; 



by R. J. HoLDEN 137 



Significance of the middle Siluric in American and European 



Geology [abstract]; by Amadeus W. Grabau 138 



Geology of the Portsmouth Basin, Maine and New Hamp- 

 shire [abstract] ; by Alfred Wandke 138 



Paleozoic sections south of James Bay [abstract] ; by Morton 



Y. Williams 138 



Arrangements for additional geological surveys in the West 

 Indies [abstract] ; by T. W. Vaughan 139 



