Rocks in Southern Connecticut. 



225 



conduit have an average clip of 35° to 36 r southward, and 

 the apparent thickness of the section is 535 feet. Prob- 

 ably at least 50 or 60 feet should be deducted because of 

 duplication by small faults. About one-fourth of the 

 section would be classed as fine-drained sandstone and 



Fig 1. 



Fig. 1. — Generalized geologic map of Saltonstall Eidge and vicinity. 

 Horizontal lining represents the area of old crystalline rocks. Cross-hatch- 

 ing represents the exposed edges of buried basaltic lava flows ; 1, the lower 

 or "anterior" sheet; 2, the middle or "main" sheet, forming Saltonstall 

 Eidge; 2(a), the same sheet in Totoket Eidge; 3, the upper or "posterior" 

 sheet; 4, probably a part of the upper sheet dragged up along the great 

 fault. Triassic sediments underlie the areas shown in plain white. 



sandy shale, the remainder as coarse sandstone and con- 

 glomerate. Layers with different textures are inter- 

 bedded, with no apparent order. In conglomerate layers 

 there are numerous well-rounded pebbles of quartz, but 

 fragments of granitic rocks, more or less angular, are the 



