CONTEXTS 3 



Page 



Types of Koeky Moiiiitaiii structure in southeastern Idaho [ah- 

 stract and tliseussion] : by (ieori;e U. Manstield 126 



Age of the scarp-producing faults of the (ireat r.asiu lahstiMctl : 

 by George D. Louderhack 127 



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

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



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

 A. P. Coleman 12S 



Drumlius 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 [alistract] : 

 by James W. Goldthwait 130 



Late Pleistocene changes of level in northern Manitoba, Canada 

 [abstract] ; by W. A. Johnston 131 



Glacial history of the Columbia River in the Big Bend country 

 [title] ; by Oscar E. Meinzer 131 



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

 Crosby 132 



Further discussioii 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 drift- 

 less and adjacent areas of the upper Mississippi Valley [ab- 

 stract] ; by F. 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 formatioiLS of Porto Rico [abstract] ; by Bela Hubbard. . 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 Marjorie 

 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 IIaini»sliire 

 [abstract] ; by Alfred Wandke 13.S 



Paleozoic sections south of James Bay [al)stract] : by Morton Y. 

 Williams 13?^ 



Arrangements for additional geologifai surveys in the West In- 

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



Geological reconnaissance of the Dominican Repul)lic [titl(»l : by 

 Charles Wythe Coi)ke ^orj 



