12 NEW YORK STATE MUSEUM 



nearly horizontal and perhaps belonging to the upper series. The 

 total section here was measured as follows : 



M I foot Light red sandstone 1 -nt . i • j- 



, . ^^., . , ^JNot shown m diagram 



L 2 leet White or gray sandstone J 



, K Concealed (unknown amount) 



J lo feet Conglomerate, red-brown matrix, with pebbles of 



white quartz and red sandstone 

 I 5 " Brownish orange sandstone with black and white 



specks 

 H 3 " Uniformly dark leaden purple sandstone 

 Gl ,,r Brilliant orange-red sandstone 



F j \ Concealed, combined with preceding in total estimate 



E 5 " Reddish, buff etc., rather banded sandstone, containing 

 D lo " occasional white quartz pebbles 

 C lO " Similar 

 B 15 " Concealed, estimated 

 A 10 " Similar to C, rather light colored. Base concealed 



Total 78 feet, not including K, L and M 



Special attention should be called to the conglomerate J, which 

 although represented as conformable in the diagram, has not been 

 proved to be so, and by carrying some pebbles of red sandstone 

 similar to the undoubted Potsdam beneath adds one more point 

 to the accumulating evidence that there is a break between this 

 and the widely distributed upper so-called " white Potsdam " beds. 



A sandstone closely resembling G of the above section has been 

 quarried at the most northerly of the group of outcrops included 

 in locality 79, north of the preceding. The other outcrops of this 

 group on the south side of the road do not in fact show any sand- 

 stone at all, in place, though fragments abound in the plowed fields, 

 but we have here the remains of some of the ferruginous basal 

 contact masses that are presently to be described, half veiling an 

 islandlike knoll of Grenville marble and quartzite and carrying a 

 workable body of red iron ore, by the roadside. 



Northwest of this group is an old quarry in red or purplish- 

 banded sandstone of ordinary Potsdam type on Judge Hale's farm, 

 locality 78. This rock also is faulted, and the color bands show a 

 secondary intersecting set running steeply across the bedding ones, 

 as in the Unkpapa sandstone of the Black hills. Some at least of 

 the multitudinous little faultslips at this quarry appear to have 



