Education Department Bulletin 



Published fortnightly by the University of the State of New York 



Entered as second-class matter June 24, 1908. at the Post Office at Albany, N. Y., under 



the act of July 16, 1894 



No. 480 ALBANY, N. Y. October i, 1910 



New York State Museum 



John M. Clarke, Director 

 Mussum Bulletin 143 



GYPSUM DEPOSITS OF NEW YORK 



BY 



D. H. NEWLAND 



AND 



HENRY LEIGHTON 



INTRODUCTION 



Gypsum has been mined in New York for the last century. The 

 present development of the industry dates back, however, scarcely 

 more than a decade. During this interval the production has grown 

 to many times its former proportions, and from a relatively insig- 

 nificant position the State has advanced intO' prominence with re- 

 gard to both the mining and manufacture of gypsum. The basis of 

 this progress is supplied by great natural resources combined with 

 unexcelled market advantages. 



The field investigations in connection with this report have ex- 

 tended over the whole area within whidi workable deposits are 

 known to exist. Some of the occurrences visited 'have not been 

 noted hitherto ; the recent extensions of productive operations, 

 moreover, have permitted a more detailed study of the deposits 

 and their distribution than was possible a few years ago. 



Acknowledgment is due the mining companies and others for 

 many courtesies received by the writers. The privilege of inspect- 

 ing the workings and plants was freely granted, and records of 



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