Triassic Formation of the Connecticut Valley. 425 



A cross- section of the district from northwest to southeast, 

 on the scale of figure 2, is given in figure 3 ; but its construc- 

 tion is not very accurate as to the values of dip and dislocation. 

 The heave of the faults is on the southeast in every case, with 

 the single exception of the 

 fault between Hiffh Rock and 

 Short Mountain, where the 

 heave is on the other side ; this 

 departure from the prevailing 

 rule of dislocation being indi- 

 cated by a corresponding departure from the prevailing rule of 

 topography. In passing northward across a fault of the 

 ordinary kind, the repeated portion of a ridge is found in what 

 Percival called " advancing order," that is, farther west than 

 before ; but here the repeated ridge is found in " receding 

 order," and hence the fault is known to have a reverse throw. 

 The distinct topographic effect of the faults is illustrated in 

 two figures. The first (fig. 4.) is a view south west ward through 

 a gap in the anterior trap ridge, on the line of the fault that 



GE.NCKf\L. Cross *5\rcrvo/v. 



NOirTH END of EASTERN RJDOE. 



SOUTH END of WESTERN RIDGE 



runs from New Britain through Shuttle meadow reservoir. 

 The heaved side of the fault is on the left (southeast), where 

 the back of the ridge is shaded by an apple orchard and its 

 outcrop bluff is clothed with hemlocks : the thrown side is on 

 the right, where the trap sheet lies lower, but rises westward 

 to another ridge like the first ; an old pasture field on its back, 

 and a bold cliff facing the broad Southington valley beyond. 

 This cliff runs two or three miles north, but shortly turns 

 around the southern end of the ridge where it is terminated 

 by the oblique fault ; the other ridge falls away to the left of 

 the view as it approaches the fault, but continues southward 

 till it is again broken by another fault, and the topographic 

 dislocation is repeated. 



The second view (fig. 5.) is of larger range : it is taken from 

 a hill about a mile east of Berlin, looking south to two masses 



