:do 



New York State Museum Bulletin 



Application pending for admission as second-class matter at the Post Office at Albany N Y 

 imder the act of August 24, 1913 ' ' 



Published monthly 



No. 181 



ALBANY, N. Y. 



January i, 191 6 



New York State Museum 



John M. Clarke, Director 



THE QUARRY MATERIALS OF NEW YORK- 

 GRANITE, GNEISS, TRAP AND MARBLE I/' 



f 



BY 



D. H. NEWLANd' 



PAGE 



Introduction 7 



The development of the quarry in- 

 dustry in New York 8 



General features of rocks and their 



commercial adaptability 12 



The origin and classification of 



rocks j2 



Rock structures 16 



Differential parting 21 



Chemical and physical properties 

 of rocks which influence their 



commercial uses 24 



The examination and testing of 



stone -i-i 



Main features of the geology of 



New York State 50 



The crystalline silicate rocks 58 



Preliminary discussion and defi- 58 



nition of terms 58 



Granite c8 



Syenite and anorthosite 60 



Diorite 61 



Gabbro " 52 



Diabase or trap 63 



Gneiss and schist , 64 



Serpentine 65 



Pegmatite '.'.'.'.'.. 66 



107 

 144 



PAGE 



Field occurrence of the granites, 



gneisses, traps etc 69 



The St Lawrence River granites 69 

 Granitic rocks in the western 



Adirondacks yg 



Granitic rocks in the eastern 



Adirondacks go 



Granitic rocks in the Highlands 



section 



The dark-colored, basic rocks. . 

 The occurrence of pegmatite in 



New York ' j^^ 



General features, field relations 



and uses of pegmatites 154 



The local distribution of pegma- 

 tites in New York State 160 



The New York marble quarries.. 176 

 General characters of mai;bles ..176 

 Geology of the New York mar- 



bles 181 



The Adirondack section 182 



The Highlands — Taconic area. . 193 



Nonmetamorphic marbles 203 



Serpen tinous marbles; verde an- 

 tique and ophicalcite 205 



Index 209 



ALBANY 



THE UNIVERSITY OF THE STATE OP NEW YORK 

 I916 

 Ms4r-Mris-2SOO 



