Ries — Geology of Orange County. 



469 



Silica, 55.00 



Iron and alumina, 34.54 



Lime, 5.33 



Magnesia, 3.43 



Alkalies, 48 



Water, 1.22 



100.00 



The clay deposit at Goshen is local, covering several acres and having 

 ;i depth of about thirty feet. The yard is run to supply the local demand. 

 Drain tile is occasionally made. 



The following analysis of clay from the Drowned Lands is given in the 

 New Jersey Geological Survey's report, 1891 : 



Si O a 53.00 



A1 8 3 . . . . 23.00 



Fe a 3 . . . 7.2 



CaO . . „ .70 



Mg O 2.60 



Alk 4.10 



H 2 9.70 



Ti 2 50 



100.8O 



Lime. The limestones of Orange county are all magnesian with the 

 exception of those of the Helderberg series. While many of the large ledges 

 in the county have been quarried for lime at one time or another, but little is 

 made at the present day. There are several kilns in operation two miles 

 southeast of Monroe, and considerable lime is also being made from the 

 Cambrian limestones west of Newburgh. These are the only two active 

 localities. There was formerly a very large amount of quarrying done in the 

 limestone ridge northeast of Arden to supply flux for the furnaces. Another 

 active quarry was southwest of Otisville, in the Pentamerus limestone. 

 It is probable that most of the Orange county limestones contain a rather 

 high percentage of silica. 



Lead. Lead occurs in fissure-veins at many points along the Shawan- 

 gunk mountain, and the prospecting of these caused considerable excitement 

 in former years. The largest opening made was at Guymard, in Mount Hope 

 township, eight miles from Port Jervis. The deposit is a true fissure-vein. 



