52 NEW YORK STATE MUSEUM 



Chase mountain fault. This fault strikes nearly north and south 

 and the chief evidences for its existence are the very prominent 

 scarp in the homogeneous granite porphyry and some suggestions 

 of shearing. The usual tilted character of the blocks is not here 

 shown. This fault probably continues southward to join the Mil- 

 lington brook fault as indicated on the map. 



Tripp mountain faults. A fault whose trend is ahnost exactly 

 north and south lies along the western base of Tripp mountain as 

 shown on the map. The evidence for this fault is largely topo- 

 graphic, such as the presence of a very distinct scarp along a 

 straight line for several miles in homogeneous igneous rock, and 

 also the rather distinct downslope toward the east from the scarp. 

 Near the south end of the fault and on the west side of the hill 

 (1221 feet) some sheared rock was noted," but for most part the 

 line of the fault is covered with rock debris. A maximum dis- 

 placement of no less than 300 to 400 feet seems to be shown. 



The southeastern face of Tripp mountain is a steep scarp which 

 has almost certainly been produced by faulting because of its pres- 

 ence in homogeneous granite porphyry and away from any con- 

 siderable stream. A throw of several hundred feet is represented. 



Tripp pond fault. This fault strikes northwest-southeast and 

 passes along the north side of Tripp pond and along the bases of 

 the mountains whose elevations are respectively 1662 and 1389 

 feet. The very steep scarp rising to a height of 700 feet and form- 

 ing the southwestern face of the mountain (1662 feet) just north 

 of Tripp pond is almost certainly a fault scarp. At the opposite 

 end of the fault the scarp is distinctly traceable along the south- 

 western face of the low mountain (1389 feet) and the little hill 

 just southwest of Sullivan pond. The scarp bere strikes at a high 

 angle across the foliation and in homogeneous rock. 



Bull Rock mountain faults. These two faults form the western 

 boundary of the mass of syenite which lies along the east-central 

 margin of the map. The shorter one strikes northwest-southeast 

 and lies along the western border of the Bull Rock mountain mass, 

 and the smaller mountain (1560 feet) just to the northwest. Gren- 

 ville, chiefly quartzite, dips downward sharply against the fault. 



The longer fault follows a perfectly straight line of hills or low 

 mountains whose elevations are respectively 1560, 15 12, 1200, and 

 1 140 feet, the throw of the fault apparently gradually diminishing 

 toward the north. The Grenville in the valley immediately west 

 of the fault consists of various gneisses with varying dips and 



