ST. LAWRENCE COUNTY. 
361 
89 . 
This mass, if examined on the borders of the primary, is often exceedingly disturbed and 
broken: the layers are often broken into short pieces, and cemented together again. An in¬ 
teresting locality exists in Dekalb, a few rods north of the village, and by the road side. In 
some instances the strata are crushed. 
This rock presents fewer varieties or kinds here than in Clinton county : the more regular 
form is preserved. It is, however, often crystalline, in which state it assumes the form and 
character of granular quartz. The lower portion is generally formed of a conglomerate, is 
often quite coarse, and fragments of quartz as large as a peck measure are common. The 
materials from which this rock is formed in this county, have been evidently derived from 
granite. Fine particles of pale brown feldspar are interspersed through the rocks, and the 
peculiar character of the quartz indicates such an origin; but a fact which sets this question 
at rest, is found in the composition of the lower layers. Tims, at Dekalb, a conglomerate, 
or rather breccia, is found, which is composed of pieces of granite containing a peculiar 
variety of tourmaline wholly confined to this particular locality ; and while the origin of the 
materials composing the rock is thus proved, we also prove that they were not transported far 
from their original or parent beds. 
Calciferous Sandrock. 
The limestone region is composed of this rock. The reader is therefore probably aware, 
that in some places, particularly near the junction of the potsdam sandstone, this also wears 
much the aspect of a sandstone ; but at a distance from their line of junction, the rock bears 
the aspect of a limestone. 
This rock forms a belt or border along the St. Lawrence river, ten miles wide. Towards 
Ogdensburgh it is much narrower, nearly runs out at Morristown, and entirely disappears 
before it reaches Hammond. This rock is very much concealed by drift and soil throughout 
this whole region: it lies low, and is never upraised much above the common level of the 
country. The following towns are based upon this rock, namely, Lisbon, Madrid, Louisville 
and Massena; and it extends over a part of Brasher and Norfolk. 
Geol. 2d Dist. 46 
