Schneider — Overthrust Faults in Central New York. 309 



way between Gilford's and Russell's faults, the two disturb- 

 ances showing the greatest amount of displacement and practi- 

 cally in a straight line with them. The layers have been 

 sharply bent along both sides of the thrust plane and secondary 

 crystals of calcite have been formed in the numerous fractures 

 in and between the layers, but not as abundantly as at East 

 Onondaga and Marcellus. Mr. Wheelock believes the amount 

 of displacement is about four feet, but it is impossible to deter- 

 mine the thrust accurately because of the marked similarity of 

 the layers of limestone. 



The continuation of this fault may be seen in the west wall 

 of the gorge, where it is not as easily accessible nor as readily 

 studied because of the accumulated material. The bending 

 and buckling of the layers is even more pronounced here than 

 on the east side of the stream, although the displacement was 

 apparently less. 



Following the direction of the fault to the eastward, a cut 

 on the trolley line just north of Dunlop's station is reached, 

 showing some disturbance and a marked anticlinal fold. The 

 fractured and disturbed condition of the layers in the entire 

 cut and especially at the fold, which is directly in the line of 

 the strike of the fault, makes it difficult to determine whether 

 the faulting has reached upward to this point. The 'fracturing 

 and shattering of the layers resembles somewhat that produced 

 in certain of the layers overlying the gypsum, and lends color 

 to the belief that Fiddler's Green marks the position of the 

 gypsum deposit. A study of the gypsum ledge to the north- 

 eastward indicates that the gypsum occurs either just above or 

 just below the cut showing the shattered layers, while a com- 

 parison of the altitudes of the adjoining gypsum deposits shows 

 that it should occur at the Fiddler Green locality. Neverthe- 

 less it has not yet been noted there. However, the gorge of 

 the creek lies below Fiddler's Green, hence it is hardly possible 

 that the faults just described can occur in the Bertie limestone 

 which is described by Clarke as overlying the gypsum. How- 

 ever, according to Clarke's map the Bertie occurs in the gorge 

 of the creek at this point. 



Fault III. Dunlofis. — Following the gorge to the north- 

 ward for a hundred yards or more, the folding and buckling of 

 the layers give evidence of another disturbance. At this point 

 the force seems to have exerted itself mainly in the bending of 

 the layers, and without any large amount of displacement. The 

 thrust plane of the fault is plainly visible, clipping at an angle 

 of 23° to the northward. The displacement is not more than 

 two feet. Fault III occurs in the same formation as that 

 already described, the Bertie dolomite (?) The fault cannot be 

 seen on the west side of the gorge because of a change in the 



