554 PROCEEDINGS OF THE SAINT LOUIS MEETING 



The fifth paper was 



PHYSIOGRAPHY AND GLACIATION OF THE WESTERN TIAN SHAN MOUNTAINS, 



TURKESTAN 



BY W. M.: DAVIS AND E. HUNTINGTON 



[Abstract'] 



The existing ranges of the Tian Shan mountains in central Turkestan result from 

 the elevation and greater or less dissection of a more ancient mountain system 

 that had been previously subdued or worn down to small relief over a large area. 

 The elevation of the old mountain region was accomplished in part with moderate 

 deformation, in part with strong block faulting. Local glaciation in several suc- 

 cessive epochs is clearly recognized. 



The paper was discussed by G. F. Wright, G. K. Gilbert, A. P. Coleman, 

 and the author. 



After some announcements, the sixth paper was presented : 



SYSTEM OF KEEPING THE RECORDS OF A STATE GEOLOGICAL SURVEY 



BY E. R. BUCKLEY 



The seventh and last paper of the day was 



TECTONIC GEOGRAPHY OF SOUTHWESTERN NEW ENGLAND AND SOUTH- 

 EASTERN NEW YORK 



BY WILLIAM H. HOBBS 



[Abstract] 



The former assumption of deformation of the New England area by a system of 

 folds not modified in an important way by fault structures has led to much con- 

 fusion, and the hypothesis has now proven inadequate to satisfactorily explain the 

 present positions and attitudes of the rock masses. The role which block faulting 

 may have played in the deformation of the area is suggested by the complex mosaic 

 of fault blocks shown to be present in the Newark rocks of the Connecticut valley, 

 the Pomperaug valley, and also worked out in less detail for the type Newark area 

 of New Jersey. The recent work of Crosby in the Boston basin, of Hitchcock on 

 the northeastern margin of the White mountains, of Cushing to the west of lake 

 Champlain, of the latter and also of Kemp in the Adirondacks district, and of 

 Grabau in Becraft mountain in southeastern New York ; all emphasize the impor- 

 tance of normal fault structures and show that a chain of areas encircling the 

 southern New England province have each a crustal architecture resulting from 

 normal faulting. The elements in these structures may, with perfect propriety, 

 be likened to blocks of a mosaic, only in this case disturbed from the normal 

 mosaic condition of uniformity of altitude. 



In a series of papers the author has called attention to the importance of fault 

 structures within the southern New England area, and in the latest of these* has 



*The geological structure of the southwestern New England region. Am. Jour. Sci., vol. 165 

 1903, pp. 437-440. 



