Se ne a ee ee ee = 
BSE a Se ee tes 
Qolitic Formation of Saratoga Gounty. N. Y. 17 
The calcareous concretions, which characterize and 
sdeasily, this formation, are, for the most part, arranged in 
successive layers throughout the strata in which they ap- 
pear ; ‘shales globular, of the size of mustard seed, bag2 
sess a shining black color, and are rey com sare of 
a cal- 
concentric layers. ‘They are united in the mass 
éareous cement, more or less granular, pk sith fine 
siliceous sand. 
More than one half of the whole mass of some of the 
strata, which constitute the series of this formation, con- 
sists of these 0 ha concretions ; in others they are more 
darkish grey cast, but they are in some places, rendered 
he PANE so of ferruginous. particles; they 
strongly resemble some vari f nd, 
eut a close inspection, might easily be mistaken for it. 
In and near the road, which leads from Greenfield to 
Ballston-spa, by the way of Rowland’s mills, on the farm — 
of Deacon Wood, there is a bank composed of a series of | 
horizontal strata where the peculiar characteristic features 
ef this formation are well defined and may be readily ex- 
amine 
One of the strata, which.compose the series at this place, 
presents a very singular appearance, and one which, if it 
occurs elsewhere, has never been noticed, so far as I am 
able to learn, by any writer. The surface py this stratum 
is ny exposed for a number of rods both to the north 
uth of the bank beneath which it ale passes, 
“ is. ans two feet in sweknes, and has imbedded, thregep: 
eee composed of aseries of successive ae ers, Psirly 
arallel and perfectly concentric ; these layers have a com- 
infer this from the fact, that he! oe holds the same relative position, 
a“ the peculiar character of that rock. In addition to this, | have 
seen i sited § with it, the same calcareons grit, (as th Englis sh au- 
ae call it,) which you shewed me as being connected with the Sargtoga 
Vou. IX.—No. 1. 3 
i re ¥ 
anne 
; ‘e: 
