•74 BULLETIN OF THE 



the bold western slope of Chauncy Peak. The fault has an offset of 

 about 1500 feet and an overlap of similar value; its heave must be 

 about 300 feet. Although of smaller displacement than the Great Fault, 

 it manifestly belongs to the same system and contributes effectively to 

 the rational explanation of the Triassic structure and topography. It 

 probably determines the location of a ravine (7) southwest of the Berlin 

 road towards Meriden, but I have not been able to follow it beyond the 

 city, as outcrops are few and monotonous in that direction. On the 

 other side of Lamentation Mountain, if there were time to go there, it 

 probably causes a slight dislocation (9) in the posterior trap ridge ; the 

 displacement is so small that in speaking of this part of the posterior 

 ridge when describing the last stretch of the first day's walk, the ridge 

 was referred to as traceable with little interruption. If this identification 

 is correct, it is probable that the throw of the fault decreases to the 

 northeast, and that its line is somewhat curved, as indicated in the figure. 

 The wide valley between Chauncy Peak and the north end of Higby, 

 or Middletown Mountain, through which the return to Meriden was 

 made on the first day, suggests a fault with throw of value interme- 

 diate between that of the Great Fault and the one just described. Its 

 examination may be conveniently begun by following the anterior of 

 Chauncy Peak southward to its vague ending (10) near the Cromwell 

 railroad. This termination must be near the southeast side of Chauncy 

 Peak block. A wide swamp, in which the engineers of the Cromwell 

 railroad found much difficulty in making a steady roadbed; conceals all 

 outcrops for some distance, but by followiug the track for half a mile 

 east from the end of the anterior, and then, at a point opposite the 

 southern end of Chauncy Peak (11), crossing a little field to the south, 

 several ridges of conglomerate (12) will be found in the woods; they 

 strike N. 35° E. and their beds dip about 10°, and after crossing four 

 or five such outcrops, a low trap ridge (13) is found; it is soon identi- 

 fied as yet another appearance of the anterior sheet, for it stands in 

 proper position with regard to the main sheet, which rises in the high 

 mountain to the east ; it is very scoriaceous on the back, where it is 

 followed by a road ; and at a few places it shows the ash and bomb 

 structure that has already in two other blocks been fotind to characterize 

 the anterior trap. It must be followed north to its end (14), which is 

 indistinctly located shortly before reaching the Meriden- Westfield road. 

 Sighting back from here, we find a bearing of about S. 65° W. will carry 

 the fault line back to the southern point of the Chauncy Peak anterior ; 

 the accordance with previous (neasures is satisfactory enough. But, in 



