488 



Russell — Relations of the Great 



but has been removed by erosion. The basalt bowlders 

 were not found below the lower trap now. They will be 

 referred to later. The pebbles of the quartz lode were of 

 its most characteristic type — whitish or bluish granular 

 quartz traversed by a network of veins, and altered 

 inclusions cemented by quartz — and some of them were 

 angular and a foot in diameter. They occur between the 

 main and upper basalt flows, and above the upper basalt 

 flow. 



Fig. 3. 



Pond 

 itocX L^-ke 



S^ltonsie.!! 



SCALE OF MILES. 



Fig. 3 — Generalized section westwards from the neighborhood of the 

 Branford Water Company's Pond north of Branford. 



5. The other sedimentary rocks. — The sedimentary 

 rocks west of the fault plane and the fanglomerates con- 

 sist of conglomerate, sandstone, and shale in frequent 

 alternation. The folds or warps enable one to follow the 

 same horizon away from the fault, and when this is done 

 it is found that the rocks in general become finer and finer 

 for a mile or two away from the fault plane. In some 

 places the gradation can be traced along the same horizon 

 from a fanglomerate to a conglomerate, then to a sand- 

 stone, and finally to a shale. These relations are shown 

 in figs. 2, 3 and 4. 



The Larger Faults op the Triassic Trough. 



That the larger faults also have a general northeast- 

 southwest strike is apparent at once from Davis 's map of 

 the Connecticut Triassic. He considered that the fault 

 separating Bluff Head and Pistapaug Mountain uplifted 



