INDEX 



The superior figure_s tell the exact place on the page in ninths ; e. g. 87* 

 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^ 



Adirondacks, comparison with north- 

 ern, 64^-65^ 



Anthracite, 26". 



Apatite, 87^ 88\ 88°, 90^ 91S 92', 92«. 



Aplite, 82«. 



Augen syenite, 89°. 



Augite, 8S^ 89*, 9(F, 90', 91\ 91^ 91^ 

 92\ 



Beekmantown formation, 10^, 25°- 

 29«, 52«-55S 56^-58° ; best exposures, ■ 

 25°, 28-; slope of the surface on 

 which deposited, 60^-62='; thick- 

 ness, 27«, 57S 60'-61' ; use as build- 

 ing stone, 81°. 



Biotite, 15°, 18=, 20', 21S 22\ 23°, 84^ 

 86^ 86°, 87^ 87^ 89^, 89*, 9(F, 90«, 

 90', 92\ 92'. 



Birdseye limestone, see Lowville 

 limestone. 



Black creek, 80«. 



Black river limestone, 10= ; thick- 

 ness, iiO''. 



Brigham, A. P., cited, 73^ 77', 78«, 

 80^. 



Bronzite, 88^ 89*, 90=", 90^ 



Building stone, 81«-82*. 



Calcif erous formation, see Beekman- 

 town formation. 



Galcite, 26', 28S 29^ 



Chalcopyrite, 27^. 



Ghamberlin, T. O., cited, 73=, 78«. 



Chazy formation, 27^ ; absence in 

 Mohawk valley, 63*. 



Chert, 26^ 28^ 



Clarke, J. M., cited, 25', 33°. 

 Clays, 83" ; laminated, 75«-77'. 

 Conglomerate, 28*. 

 Cumings, E. R., cited, 25°. 



Darton, N. H., cited, 25', 28=, 38', 39=, 



42', 44S 57*, 62*. 

 Deformation period, 12*. 

 Diabase, use for road metal, 82'. 

 Diabase dike, 17°. 

 Diamond hill, 26*, 57^ 

 Dikes, 12^ 

 Dip, 35'-36°. 



Dolgeville fault, 13», 38=, 43»-47'. 

 Dolomite, 26'. 

 Drainage, 77'-81=. 



Economic geology, 81', 85*. 



Faults, 38*-47'; how produced, 12'; 



Dolgeville, 13'; Little Falls, 13'; 



influence on topography, 71'-73\ 

 Feldspar, 15', 16S 18°, 2V, 22', 23°, 



24S 86=, 87', 87', 88^ 88', 89=, 90\ 



91', 92'^. 

 Folds, 37^-38*. 

 Foliation, 6=, 47'-48'. 



Gabbros, 89*. 



Galena, 27-. 



Garnets, 18^ 22=, 86', 86°, 87», 87'. 



88^ 89*. 

 Geographic position, 4\ 

 Geology, general, 4°-15''. 

 Glacial deposits, 73='-81». 

 Glacial period, 14*. 

 Glauconite, 27S 27'. 



