REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1900 rl75 



CaO 29.07 



MgO 16.2^ 



CO2 40.7ft 



Tomkins Cove, Rockland co. The Tomkins Cove stone supply co. 



operates extensive quarries (78), shown on pi. 60, at this point on 



the west shore of the Hudson river. The material quarried is 



a light blue, silicious limestone of the Stockbridge formation. 



The entire product, which is very large, is used for road metal. 



Ries^ gives the following analysis: 



Si02 12 



AI2O3 4.1a 



Fe203 1.05^ 



CaO 26.34 



MgO 16.74 



CO2 39.1 



Newburg, Orange co. Miller's quarry (72) is located southwest 

 of Xewburg on the flank of Snake hill. The product, a blue mag- 

 nesian limestone, is mostly burned into lime, though also used 

 locally for structural work. 



An analysis of the limestone from Miller's quarry is given by 

 Eies.i 



Si02 10.46 



AI2O3 1.93 



FegOs 1.8 



CaO 27.75 



MgO 17.65 



CO2 40-99 



Roseton, Orange co. A small quarry (79) in the blue Barnegat 

 limestone near Roseton has been worked irregularly but is not 

 at present producing. 



Newburg Junction, Orange co. The limestone quarry (69) just 

 east of the railroad at Newburg Junction, Orange co., show^ 

 Cambro-Silurian blue limestone, with interstratified black and 

 yellow shales. Pre-Cambrian gneiss is shown on the upper edge 

 of the eastern wall of the opening. The quarry is not at present 

 worked but has supplied a considerable amount of material both 

 for lime and flux. It is possible it will furnish macadam for 

 roads in the vicinity. 



^Ries. N. Y. state geol. 17th an. rep't. 1899. 



