•joo 



NEW RED SANDSTONE. 



\ 11 NEW RED SANDSTONE. 



I - - agulai fact, that this rock, w ! lion is above the Carboniferous series, 



■ along in close proximitj to Upper Silurian rocks, almost touch the <>M Red 

 ad yet never be found reposing upon either, ft occupies a small area only in 

 \ J k. It borders the west of tin' Hudson river for twenty miles, underlying ill that 

 remarkable and highly picturesque shore known as the Palisadoes. The sandstone -tip- 

 ports the pillars, the material of which seems to have been ejected through the rents in the 

 [stone beds. That this may have taken place is not at all improbable, inasmuch as 

 the material of which the columns of greenstone are composed is interlaminated with the 

 lav tdstone in such a way that it can scarcely be questioned but that it was forced 



between them after consolidation, and while the greenstone was in a molten state. This 

 in. tit is corroborated by the appearance of the sandstone. It is not only partialis 

 melted, but the iron, which formed a constituent part of it, is segregated into masses and 

 thin veins in a crystalline state. Fig. 32 is an illustration of the relative position of the 

 - near Slaughter's landing. 



Fig. 



1 i 



39. 





!h 



MP 



Q 





— - 









^=^zi_r: 





-izontal beds of sandstone : the s Met with the greenstone above, is often white 



ray, compact and har of which r. • 



lumnar greenstone, resting upon I ne. 



e. Injected beds of the same, and communicating with the columnar mass above. 



Thi ne is undistinguishable lithologically from the Old Red or even the 



Medina sandstone : ii is at i iglomerate. Tin- Potomac marble, as it is called, forms 



ise of this rock. This rare conglomerate rests on the Magnesian slate and Sparry 



