42 NEW YORK STATE MUSEUM 



At the second turn, where the fault swerves again to the north, 

 a little brook crosses the fault line and exposes the very excellent 

 section shown in figure 6, Utica shales, with gradually increasing 

 dip due to drag, appear on the dropped side, the dip rising to 

 60° near the fault plane. Just at the fault a small block of 

 black limestone like that of the passage beds appears with ver- 

 tical dip, and then flat lying layers of the Trenton appear, be- 

 yond which nearly the full thickness of that formation and the 

 overlying passage beds is shown. The throw here is even less 

 than in the previous case, quite certainly under 300 feet, empha- 

 sizing the probable presence of an undetected branch fault. If 

 such be not present, the throw of the fault has diminished two 



3eekrt)Qntown LowrviUe Tren+on XJf'ica. 



Fig. C Section across the Little Falls fault. Scale, 200 yd=l in. 



thirds in amount, and yet rapidly increases to the northward 

 from this point up to its original size. 



The trend of the small fault at Little Falls would carry it into 

 the main fault at this corner, provided it extends so far. But 

 the throw of this fault is very slight at best, so that it can not 

 be traced beyond the river, and the junction is simply inferred. 



Nearly 1 mile north of this locality a second fault appears, 

 which seems clearly a branch of the main fault, though its actual 

 point of union with that cannot be located. For a distance of 

 a half mile (to the "Gulf" and a little beyond) the two faults 

 can be traced, running nearly parallel for most of the distance, 

 and giving rise to the apparent rock confusion at the " Gulf," 

 which Darton seems to have interpreted as due to the depth of 

 the stream cutting^. One of the sections of the structure section 

 sheet map crosses the fault at this point and shows the writer's 

 conception of the conditions. Barton's measurement of the throAV 



^N. Y, State Geol. Mfh An. Rep't. 1894. p.37 and map opposite p.32. 



