EVIDENCES OF FAULTING. 527 



over which the Highland Park waterfall descends. At this locality there 

 are indications of a small preglacial, marginal valley now filled with 

 drift, but the section is too obscure to make a positive statement. At 

 the northern end of this fault-line the crystallines are much shattered 

 and to some extent recemented. The facts here recorded are accepted 

 as conclusive evidence of faulting along this division of the marginal 

 line. This fault is considered to have a much smaller value than num- 

 ber 1, as will be explained later. 



Division number 5 is lacking in evidence that shows the direct rela- 

 tion of Trias to old crystallines. However, the border metamorphism of 

 the old cr3^stallines is well marked, and at a small mill two and a half 

 miles northeast of Ellington there is an excellent brecciation of the crys- 

 tallines which has resulted in considerable decomj)Osition. The fact of 

 faulting is unquestionable, but the post-Triassic date has to be inferred 

 from analogy with divisions 1 and 3. It is a satisfaction to record that 

 after the work had been carried to this stage comparison with the un- 

 published work of Professor Emerson in Massachusetts showed entire 

 accordance in results. 



Fault number 2, as previously stated, has not been established along 

 the contact line, but both to the northeast in the crystallines and south- 

 west in the Trias the evidences of a fault-line are good. In the crvstal- 

 lines near the border line the projection of this fault-line first follows a 

 stream valley and then is covered by drift until Bolton Notch is reached, 

 distant three miles from the margin. Here along the cut of the New 

 York and New England railroad numerous fault-breaks are noted hav- 

 ing strikes in a northeast direction. The breccias seen belong to faults 

 of small throw ; the greater lines of break are probably concealed by 

 erosion. Turning in the other direction to the Triassic area, the next 

 to largest fault identified, having a throw of about 2,000 feet, has been 

 traced from the old crystalHnes on the western side of the basin to South 

 Glastonbury, a distance of 26 miles. The direction of the fault is about 

 northeast and with little variation. It does not seem unreasonable to 

 continue the line of dislocation northeastward, connecting with the fault 

 indications at Bolton Notch. Further reason for believing in this exten- 

 sion will be given when the measurement of the faults is explained. 



The inference with regard to fault number 4 is based upon evidence 

 similar to the above. The nortlieast extension of this fault is indicated 

 in the northeast part of Rockville in a small quarry by breaking and 

 slickensiding. The line follows a general valley depression in the crystal- 

 line plateau, and is indicated by local cortortion and alteration of the 

 crystallines and by breccias. These indications have been traced north- 

 eastward for eight miles from the border. The continuity of this fault is 



