I 



2 



3 



L 



\ 



:> 



f 



) 



■ 51 



1.03 



.40 



2 



93 



8.31 



4 



00 



1. 19 



.41 



2.97 



I 



92 



4-53 



I 



74 



•79 



1.27 



•77 



I 



10 



1-34 



I 



II 



30.62 



30-74 



30.76 



26 



27 



21 .50 



29 



36 



1 . 20 



2 .01 



1-53 



8 



29 



7 . 20 



2 



81 



43-59 



42.39 



43-78 



33 



83 



30-47 



35 



79 



1 .02 



2 . 20 



2.80 



II 



.02 



9-50 



6 



•38 



20.52 



J8.19 



17-53 



14 



87 . 



14-53 

 97-38 



17 



93 



99-44 



98.24 



100.54 



100 



23 



99 



12 



93-74 



91.27 



94.26 



72 



84 



65-49 



77 



06 



60 NEW YORK STATE MUSEUM 



Si02 



AI2O3 



Fe203 



CaO 



MgO 



SO3 



CO2 



H2O 



Gypsum calculated 



1 Akron, Erie co. 



2 Oakfield, Genesee co. 



3 Oakfield, Genesee co. 



4 Garbutt, Monroe co. 



5 Lyndon, Onondaga co. 



6 Lyndon, Onondaga co. 



The following incomplete analyses are from the paper by Artbur 



L. Parsons,^ with the exception of no. 8 which is taken from The 



Mining and Quarry Industry of New York State for 1907.^ 



12345678 



Gypsum 82.5 70.3 94 03 74-09 64.53 73 -9^ 82.66 87.48 



Silica & insol 6.05 11.17 4-62 3.86 3.34 



Other matter. 17.5 .... 5.97 19.86 24.27 21.44 13 -48 8.93 



1 Wheatland, Monroe co. Under " other matter " are included 



CaC03 1.75; MgC03 3-6. 



2 Wheatland, Monroe co. Analysis furnished by Iroquois Port- 



land Cement Co. 



3 Wheatland, Monroe co. Analysis furnished by Consolidated 



Wheatland Plaster Co. 



4 Union Springs, Cayuga co. 



5 Fayetteville, Onondaga co. 



6 Fayetteville, Onondaga co. 



7 Cottons, Madison co. " Other matter " includes AI2O3, Fe^O^ 



1.84; CaCO, 6.57; MgCO. 5.07. 



8 Jamesville, Onondaga co. " Other matter " includes AlgOo, 



FeoOg 2.92; CaCOa 3.33; MgCOg 2.69. 



The analyses indicate that the gypsum content of the rock ranges 

 between the general limits of 64 or 65 per cent and 95 per cent. 

 The grade apparently improves toward the western end of the sec- 

 tion, in Genesee and Erie counties, v\diere the average is above 90 

 per cent. The rock in this part is also the lightest in color and 

 yields nearly white plaster. 



^ N. Y. State Geol. An. Rep't 23. 1904. 

 2 N. Y. State Mus. Bui. 120. 1907. 



I 



