Geology of the Catskills. 249 
of pipe i Straton, it would appear that the polish thus giv- 
© granite, may be said to be as imperishable, as the ma- 
real itself to which it is applied. 
I had an opportunity of making these observations while 
engaged in erecting a granite monument, ornamented with 
black pilasters. The workmen succeeded most perfectly in 
giving mor: black polish to the granite, in the manner I have 
di” 
Art. - —WNotice of the Geology of the Catdalls3 3 by 
r. D. W. Barton, of Virginia—with a Pla 
Tue study of Geology becomes more satisfactory, the 
nearer approach to perfect uniformity, we discover in the ar- 
a stratification of the same minerals in different 
parts of the world—when they exhibit the same Eaagiearee 
structure—the same relation, position, and the same asso- 
ciation with other minerals. It is an object of no icon’ impor- 
tance to be able to establish the gedlogical identity of remote 
sections of the same country, and to trace particular mine- 
rals through an extent of several hundred miles, with little or 
no interruption of continuity, and invariably accompanied 
by the same rocks. J have recently examined, with some 
degree of minuteness, the geology of the Catskills and their 
vicinity, with a design to compare the northern extremity 
of the transition region of the U. States with a corresponding 
section in the south. The result of my observations is ex- 
hibited in the accompanying chart. If in some instances I 
ve not given to a stratum of rocks its appropriate designa- 
tion, the error will be of little consequence, since it cannot 
materially affect the accuracy of the comparison which I 
propose: 
In addition to this imperfect delineation of the geology of 
the Catskill Mountains, I am enabled to notice several lo- 
calities of minerals which have not hitherto been described. 
ist, On the side of the Mountain which rises immediately to 
the north of eT clove, and about a quarter of a mile 
pees! aneliigiot r. Absalom Smith, is a ledge of com- 
il illaceous slate, of So which during the winter and 
sprig, a small stream stream, strongly impregnated with 
m. ‘On ariving at the surface of the rock, the fluid is 
