INDEX TO GEOLOGY OF THE VICINITY OF LITTLE FALLS 



95 



Silica, 86 7 . 



Sillimanite, 18 8 . 



Smyth, C. H. jr, cited, 60*. 



Sphalerite, 27 2 . 



Spruce creek, 80*. 



Structural geology, 35 8 -36 9 . 



Syenite gneiss, 20 8 -21 5 , 85 2 , 89 8 -90 s . 



Syenites, 15 8 , 16 2 , 89 2 ; age, IT, 23; 

 augen, 89 9 ; mixed rocks about, 21 6 - 

 23?; quarried, S2 2 ; use for road 

 metal, 82 T . 



Taconic disturbance, II 2 . 

 Till, 74". 



Titanlte, 86 r , 90 2 . 



Topography, GS^TS 2 ; influence of 

 faults on, 71 8 -73 1 . 



Trenton formation, 10 4 , 29 8 -35 6 ; best 

 exposures, 32 7 ; ripple marks in, 

 34 2 ; thickness, 31 7 , S3 6 ; sudden 

 thickening westward, 63M54 8 ; un- 

 conformity at base of, 62 2 -63* ; use 

 for road metal, 82 s , 83". 



Utica shale, 10 s , S3 1 , 34 8 -35 7 ; thick- 

 ness, 35 T . 



Vanuxem, L., cited, 25 9 , 28 5 , 38, 62*. 

 Volcanic activity, T. 



Walcott, C. D., cited, 35 7 , 51 9 -52 1 , 53". 

 White, T. G., cited, 38". 



Zinc blende, 27 a . 



Zircons, 86", 87 2 , 88 1 , 88 9 , 90 2 , 92. 



