in the Cayuga Lake Region, 



241 



tact metamorpliism is not conspicuous but a gradation of 

 texture is frequently noticed and the limestone is often 

 indurated for an inch or more. Calcite has very nearly 

 filled all the cavities opened up and on this soft medium 

 is recorded the usual N-S horizontal movement of the 

 region. So evidence other than faulting falls in line. 

 The north and south walls of the quarry very nearly par- 



Fig. 8. — Horizontal faulting- in the Hamilton shale at the big Falls, Lud- 

 lowrille, X. Y. The fault plane is just above the surface of the pool. 



allel the axis of the fold so that the curved lines of dip 

 shown in these two walls as well as the eastern, together 

 with discrepancies in dip indicate a torsional movement, 

 elevation at no two corners corresponding. 



Faults in the Hamilton Shale. 

 Quite another type of faulting from that already dis- 

 cussed is found in the shaly members of the Hamilton. 

 Here faults occur which are either movements along bed- 

 ding planes or parallel with them, on through various 



