INDEX 



The superior figures tell the exact place on the page in ninths ; e. g. 87 3 

 means page 87 beginning in the third ninth of the page, i. e. about one third 

 of the way down. 



Adams, F. D., cited, 19 2 . 



Adirondacks, comparison with north- 

 ern, 64 7 -65 8 . 



Anthracite, 26". 



Apatite, 87 3 , 88 1 , 88", 90 2 , 91 1 , 92*, 92 8 . 



Aplite, 82". 



Augen syenite, 89". 



Augite, 88 2 , 89 4 , 90 2 , 90 7 , 91 1 , 91 5 , 91 T , 

 92 1 . 



Beekmantown formation, 10^, 25 5 - 

 29, 52 9 -55 8 , 56 9 -58 9 ; best exposures, 

 25 5 , 28 2 ; slope of the surface on 

 which deposited, 60 T -62 2 ; thick- 

 ness, 27", 57 1 , 60 7 -61 2 ; use as build- 

 ing stone, 81 9 . 



Biotite, 15 9 , 18 5 , 20 8 , 21 s , 22 1 , 23 9 , 84 7 , 

 86 7 , 86 9 , 87 3 , 87 7 , 89 1 , 89 4 , 90 2 , 90', 

 90 7 , 92 1 , 92. 



Birdseye limestone, see Lowville 

 limestone. 



Black creek, 80. 



Black river limestone, 10"; thick- 

 ness, bO 7 . 



Brigham, A. P., cited, 73", 7T 7 , 78 8 , 

 80 5 . 



Bronzite, 88 2 , 89 4 , 90 3 , 90 7 . 



Building stone, 81-82 4 . 



Calcif erous formation, see Beekman- 

 town formation. 



Calcite, 26 7 , 28 1 , 29 s . 



Chalcopyrite, 2T 2 . 



Chamberlin, T. C., cited, 73 s , 78 8 . 



Chazy formation, 27 8 ; absence in 

 Mohawk valley, 63*. 



Chert, 26 s , 28 1 . 



Clarke, J. M., cited, 25 8 , 33 9 . 

 Clays, 83" ; laminated, 75 6 -77 T . 

 Conglomerate, 28 1 . 

 Cumings, B. R., cited, 25 9 . 



Barton, N. H., cited, 25 8 , 28 5 , 38 8 , 39*, 



42 8 , 44 2 , 57*, 62*. 

 Deformation period, 12*. 

 Diabase, use for road metal, 82 9 . 

 Diabase dike, 17'. 

 Diamond hill, 26 4 , 57'. 

 Dikes, 12 2 . 

 Dip, 35 8 -36 9 . 



Dolgeville fault, 13, 38 5 , 43 9 -47>. 

 Dolomite, 26 3 . 

 Drainage, 77 7 -81 5 . 



Economic geology, 81 6 , 85'. 



Faults, SS^T 2 ; how produced, 12*; 



Dolgeville, 13 s ; Little Falls, 13 s ; 



influence on topography, 71 6 -73 1 . 

 Feldspar, 15", 16 1 , 18 9 , 21 2 , 22 s , 23*, 



24 1 , 86 5 , 87 3 , 87 7 , 88 2 , 88 8 , 89^, 90 1 , 



91 7 , 92 s . 

 Folds, S^-SS*. 

 Foliation, 6^, 47 s -48. 



Gabbros, 89 4 . 



Galena, 27 2 . 



Garnets, 18', 22 5 , 86 7 , 86 9 , 87 f , 8T 7 , 



88 2 , 89 4 . 



Geographic position, 4 1 . 

 Geology, general, 4 9 -15 8 . 

 Glacial deposits, 73 2 -81. 

 Glacial period, 14 4 . 

 Glauconite, 27 1 , 27 8 . 



