Concretions in Sout/ici'n AVxc York. — Kindle 
301 
2. Thin bedded gray sandstone, 18 in. 
I. Heavy bedded sandstone . . . . 4 ft. 
It will be noted that two zones of concretions appear in the 
section about eight feet apart. Those in the upper horizon 
are small, concretionary masses similar to those commonly 
met with in the Chemunti^. and present no features of special 
interest. The concretionary aggregations of the lower bed, 
(No. 3), arc for the most part much larger than those of 
the upper. The long quarry face extending for more than 
three hundred feet along the side of the hill affords an excel- 
lent opportunity to examine this bed. At one end of the quarry 
it is seen to be a fiiie grained, massive sandstone, entirely free 
from concretions. This sandstone bed breaks up towards the 
middle of the quarry into a mass of arenaceous concretions of 
various sizes. These vary from less than a foot in diameter 
to masses live or six feet across and weighing many tons, the 
larger sizes predominating. The shape is extremely variable 
and includes a great variety of irregular forms, a common type 
among the larger masses being roughly quadrilateral in cross- 
section, as shown in figure i. 
Fig. 1. Concretions in sandstone with a band of fossils forming part of 
the outer shell of the larger ones. 
These aggregations are much harder than the associated 
beds, and contain apparently a larger percentage of ferruginous 
matter, and have a darker color than the rest of the sandstone 
bed to which they belong. In brief, they agree in most of their 
general features with the characters of arenaceous concretions 
which have been observed in sctires of other concretionary 
bands in the Chenning. save in one partictilar. 
