94 



NEW YORK STATE MUSEUM 



Gneisses, black hornblende, 20 s ; con- 

 taining garnets, 22 5 ; gray, 23 8 ; 

 greenish, 21 9 , 23 8 ; greenish gray, 

 20*; igneous, 88 3 -89"; red, 20*; 

 syenite, 20 S -21 6 . 



Granite gneisses, 88". 



Graphite, 18 8 , 86 9 , 87 s , 88 2 . 



Gravel, 83 7 . 



Grenville rocks, 17 9 -19 8 , 21 7 , 28 5 , 85 8 - 

 88 s ; igneous rocks associated with, 

 19 8 -20 8 . 



Hall, James, cited, 25". 

 Hornblende, 15 9 , 18 5 , 20 3 , 21 8 , 22 1 , 22", 



89 1 , 89 4 , 90 2 , 90 7 , 91 7 , 92 2 , 92 6 . 

 Hypersthene, 89*, 91 9 . 



Igneous action, 5 8 -12. 

 Igneous gneisses, 88 s -89 8 . 

 Igneous rocks, associated with the 

 Grenville, 19 8 -20 8 . 



Joints, 7 9 , 48 3 -51 4 . 



Kayser, A. O., brick manufacture, 



83 8 . 

 Kemp, J. F., cited, 60 2 , 60 8 . 



Leaf gneisses, 19 2 , 20 5 . 



Leperditia, 29. 



Lime, 88 3 . 



Little Falls fault, 13 4 , 38 4 , 38 8 -43 9 . 



Little Falls outlier, 15 7 -19 T . 



Lorraine shales, 35 2 . 



Lowville limestone, 1C 5 , 27 8 , 29 s , 29 8 - 

 30 5 , 31 3 ; thickness, 30 1 ; use as 

 building stone, 81 6 -82 4 ; use for 

 road metal, S2 5 , 83*. 



Magnesia, 88 s . 



Magnetite, 15", 18 5 , 23 9 , 86 7 , 87 s , 88 9 , 



89 s , 90 2 , 90 7 , 91 7 , 92 1 , 92 s . 

 Malachite, 26 9 . 

 Manheim fault, 38 s . 

 Marcasite, 28 2 , 34 7 , 45. 

 Mica, black, 15 9 , 18 6 , 20 3 , 21 s , 22 1 , 23 9 , 



84 7 , 86 7 , 86 9 , 8T 8 , 87 7 , 89 1 , 89*, 90 2 , 



90 6 , 90 7 , 92 1 , 92. 



Middleville outliers, 15 7 -19 T . 

 Monzonite, 22 5 . 

 Moraines, 75 l . 



Orthoceras, 34 3 . 



Orton, Edward, cited, 53 9 , 55 8 , 55". 

 Overlap on pre-Cambrian floor, 51 6 - 

 56". 



Paleozoic, some oscillations of level 

 during, 51 4 -65 8 . 



Paleozoic rocks, 24 2 -35 7 ; joints, 50 7 - 

 51* ; present surface, 68 7 -71 5 . 



Pegmatite, 22*. 



Petrography of the pi?e-Cambrian 

 rocks, 85 8 -92". 



Physical changes, sketch of, 5 a -15 5 . 



Pleistocene deposits, 73 ? -81 5 . 



Pleonaste, 86. 



Porphyrite feldspar, 21 2 . 



Porphyritic rocks, 16 9 , 22 9 -23 2 . 



Potsdam sandstone, 9 8 , 24 2 -25 4 . 



Pre-Cambrian floor, 66 3 -68 8 ; charac- 

 ter and slope, 59 1 -62 2 ; paleozoic 

 overlap on, 51 9 -56 8 . 



Pre-Cambrian rocks, 15 s -24 2 ; joints, 

 48 8 -50 7 ; northeast of Little Falls, 

 23 8 -24 2 ; petrography, 85 8 -92 9 . 



Prosser, O. S., cited, 25 9 , 27 6 , 30 2 , 33 9 , 

 34 9 , 39 7 , 53 9 , 54 3 , 62*. 



Pyrite, 27 a , 28 2 , 28 6 , 34 7 , 45 9 , 87 2 , 87 6 , 

 S9 6 . 



Pyroxene, 15 9 , 20 s , 21 3 , 22 1 , 22 s , 23 9 . 



Pyroxene gneisses, 89 4 . 



Quartz, 15 8 , 18, 18 9 , 22 4 , 23 9 , 26 s , 28 1 , 

 28 e , 86 4 , 88 8 , 90 1 , 91 1 , 91 8 , 91 7 , 92*. 



Hies, H., cited, 83 9 . 

 Road metal, 82 4 -83 6 . 

 Ruedemann, R., cited, 65*. 



Salisbury iron mine,' 83 8 -85 8 ; rocks, 



90 8 -92 9 . 



Sand, 75 6 -77 7 , 83 7 . 

 Sea level, length of time district has 



been above, 13 5 . 



