HBW YOU -MM 



>rominen1 at the track level about 2 mile 



is fine grained, moderately hard, 



nal impure layers, but comparatively few 



impurit mostly iron and clay. It is 



•k, with layers & to 8 feet thick, the total thickness 



about . ftd ifl favorably situated for either rail or 



• nt. 



An analysis made of samples taken by the writer from the ledge 



ring showed: 



Sili 5.7 



Alumina [ .. 



Tic oxid J 



Lime carbonate 88.5 



• -i ii in carbonate 1.4 



Insoluble 8.8 



Ulster county 1 

 The limestone formations occurring in Ulster county together 

 with their thickness are as follows: 



Feet 



Onondaga 60 Cherty 



Upper shaly limestone 30-125 Impure 



Becraft limestone 20-30 Fairly pure 



Lower shaly limestone 60 Impure 



Pentamerus limestone 30-60 Dark massive 



Tentaculite limestone 20-40 Thin bedded 



l -lit Beries 20-50 Cement and waterlime 



Niagara limestone 0-45 



Wappinger limestone 200 Silieious 



1 Darton. G i Ulster county, [see 13th an. rop't N. Y. state geol. 

 . -7). 

 Dale, T. V The fault at Rondout [see Am. jour. wsi. 1879. 18: 203) 

 Davie, W. M. The little mountain east of the Catskill. (see Appalachia, 

 20) 

 . Non-conformity at Itnn.lout N. Y. (see Am. jour. sci. 1883. 



. Becraff mountain, [see Am. jour. sci. 1883. 26: 381) 



. Tho folded Helderberg limestones. (eeeBul.Mua. corap. zool. Har- 



rar 1 



Mndsley. G f l!i« cement quarries, (see Foii£hkeepsie soc. nat. sci. 



11: 44) 



I L Economic geol gy of Ulster county, (see 13th an. rep't X Y. 

 . 

 W W. Geol. 1st diet. X. Y. 1843. 



