IV BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 

 Titles and abstracts of papers and discussions thereon, presented 

 before tbe morning session 56 



Recent work in France and Switzerland on the structure of 

 the Alps ; by Emmanuel de Margerie 56 



A layman's view of the theory of isostasy [abstract and dis- 

 cussion] ; by C. K. Leith 57 



Rectilinear shorelines of the New England-Acadian region 

 [abstract] ; by Douglas W. Johnson 57 



Dynamics of faulting and folding [abstract] ; by Harry 

 Fielding Reid 58 



Criteria for the recognition of active faults ; by Stephen 

 Taber 58 



Fault map of California [abstract] ; by Bailey Willis 58 



Faults of the Coast Ranges of California [abstract and dis- 

 cussion] ; by Bailey Willis 58 



Late Tertiary and Quaternary diastrophism in southern Cebu, 

 Philippine Islands [abstract] ; by George D. Louderback 

 and R. R. Morse 50 



Parallel folds and boudinage [abstract] ; by Terence T. 



Quirke 59 



Group photograph 60 



Luncheon given bj' the University 60 



Sessions of Friday afternoon 60 



Sectional meeting of Friday afternoon for Group A 60 



Titles and abstracts of papers of Group A and discussions thereon 61 



Contributions to the hypothesis of mountain formation ; by 

 E. C. Andrews 61 



Earth's crust and its evolution [abstract and discussion] ; by 

 R. A. Daly 61 



Orogenic exigencies of a rotary earth [abstract] ; by Charles 

 R. Keyes 62 



Isostasy as a result of earth shrinkage [abstract] ; by Fran- 

 cis Parker Shepard 62 



Fissility of shale : Some factors concerned in its development 

 [abstract] ; by J. Yolney Lewis 63 



Development of shrinkage cracks in sediments without ex- 

 posure to the atmosphere [abstract] ; by W. H. Twenhofel 64 



Observations on the range and distribution of certain types 

 of Canadian Pleistocene concretions [abstract and discus- 

 sion] ; by Edward M. Kindle 64 



Boom Beach (Isle-au-Haut, Maine), a sea-mill [abstract and 

 discussion] ; by John M. Clarke 65 



Crystalline rocks of the Plains ; by Charles N. Gould 66 



Precambrian folding in North America ; by William J. 

 Miller 66 



Notes on the salt domes of North America [abstract] ; by E. 

 De Golyer 66 



Some structural features of northern Idaho [abstract] ; by 

 Joseph B. Umpleby 66 



