GEOLOGY OF THE VICINITY OF LITTLE FALLS 



41 



Lowville and Trenton api)ear, close to the more southerly branch 

 of the fault, with a nearly or quite vertical dip. Figure oh, 

 shows the conditions at this point. A few yards farther west 

 there is exposed a rubble zone composed of broken up fragments 

 of Beekmantown, Low^ville and Trenton limestone, with an ex- 

 posed width of 20 feet, which marks the fault plane of the south 

 branch of the fault, the flat Beekmantown showing directly to the 

 south, but no rock shows just to the north of the rubble zone. 



The throw of the fault here can only be conjectured. The 

 entire Trenton and passage beds are thrown out, together with 



BeeKm4ntoY<r\ UwuiWe Trenton Ul»ca. 



B 



3eekm<antown i^ovri/iUe Trenton U+ica 



Fig. 5 Sections across the Little Falls fault. Scale, 75 yd=l In. 



unknown amounts of the BeekmantoAvn and Utica. The exposed 

 Beekmantown at the south is however very near the summit of 

 the formation, so that no large amount of it is involved. On the 

 dropped side the exposed Utica would also seem to be near the 

 base of the formation, since the upper passage beds are exposed 

 not far away. The throw would therefore seem not to exceed 

 300 feet here. This greatly diminished throw in a distance com- 

 paratively so short, coupled with the fact that still farther aorth 

 the throw is approximately the same as at Little Falls, leads 

 the writer to conjecture that quite likely the fault branches at 

 the turn, and that this branch has remained undetected, owing 

 to scarcity of outcrops. That the fault should suddenly diminish 

 so greatly in magnitude, and then shortly reach again its former 

 importance, might perhaps be brought about by its change in 

 direction, but this would seem to be very unlikely. 



