CONTENTS 



Introductiou r25 



Topography r25 



Sands in the northern portion of the lake belt r2S 



Observations in the anorthosite area rSO 



General statement r31 



Section between Saranac and Lake Clear, N. Y. C. & H. R. B. R. r32 



Exposures in the vicinity of Saranac r35 



Section west from Saranac Inn station, N. Y. C. & H. R. R. R . . . r37 



Exposures about Brandon r39 



General summary of previous sections r40 



Observations along the southwest anorthosite boundary r41 



Section from Tupper lake to Rollins pond, N. Y. C. & H. R. R. R. r42 



Section from Tupper Lake village toward Wawbeek r44 



Relation of augite syenite to gneiss r47 



Section from Tupper Lake junction to Horseshoe r47 



District between Big Tupper lake and Horseshoe pond r52 



General conclusions ro7 



Classification of the Adirondack pre-Cambrian roS 



Recent work of Kemp and Smyth r60 



Relationship of the syenite and granite to anorthosite r62 



The eruptive core of the Adirondacks r64 



Order of succession of the Adirondack eruptives r68 



Chemical analyses and discussion r68 



Molecular ratios r69 



Discussion ^^'^^ 



General characters of the Adirondack eruptives ^75 



Nomenclature ^'^^ 



