New York State Museum Bulletin 



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



under the act of August 24, 19 12 



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 



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 12 



Rock structures 16 



Differential parting 21 



Chemical and physical properties 

 of rocks which influence their 



commercial uses 24 



The examination and testing of 



stone 33 



Main features of the geology of 



New York State 50 



The crystalline silicate rocks 58 



Preliminary discussion and defl- 58 



nition of terms 58 



Granite 58 



Syenite and anorthosite 60 



Diorite 61 



Gabbro 62 



Diabase or trap 63 



Gneiss and schist 64 



Serpentine 65 



Pegmatite 66 



page 

 Field occurrence of the granites. 



gneisses, traps' etc 69 



The St Lawrence River granites 69 

 Granitic rocks in the western 



Adirondacks 79 



Granitic rocks in the eastern 



Adirondacks 90 



Granitic rocks in the Highlands 



section 107 



The dark-colored, basic rocks. . 144 

 The occurrence of pegmatite in 



New York 154 



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 marbles. . 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 



