ORIGIN OF THE TRIASSIC TROUGH OF CONNECTICUT 695 



tent opinion places this thickness between 12,000 and 13,000 feet 

 or between 2j and 2^ miles. Let a represent the angle of dip 

 developed in the basal beds by the gradual depression of the trough. 

 At the sides of the geosnycline the actual angle would be greater 

 than that indicated whereas, at the center, the beds would be flat, 

 since the basin would be concave (Fig. 5). In either Case I (Fig. 

 6) or Case II (Fig. 7) it should be noted that the beds laid down at 



-♦w*- 



FiG. 6.— 



Fig. 7. — 



the close of the period of sedimentation were approxiamtely hori- 

 zontal, a fact overlooked by some writers. The diagrams are drawn 

 to scale for a width of 17 miles and depths of 2| and 2^ miles, 

 respectively. 



Whether the geosynclinal or the fault-monoclinal hypothesis be 

 accepted, the present dips of the sediments of the basin were pro- 

 duced at the time of the post-Triassic faulting movements which 

 tilted the rocks to the east. It would be advantageous to compare 



