1 es 
Geology, Mineralogy, ere &c. 201 
somposed entirely of different substances. The rockts gran- 
ite; the pillars which support it are timestone.* The position 
also, is a natural one. ‘There is no mountain or other ele- 
vation near it from which the rock could have been thrown. 
The hill in which its pillars are fixed, is penetrated with 
limestone rocks, with here and there a specimen of granite 
intermingled ; so that their position has not been altered by 
any convulsion of nature. Here then, the Geologist finds 
a limestone of whose early foundation he can have no 
doubt. If granite be a primitive rock the strata on which it 
rests must at least be as early in the order of nature. From 
a specimen whose character is so indubitably fixed, we may 
proceed with safety not only to name, but to describe the 
species to which it belongs. Upon examination, the de- 
scription of the limestone in question will-not be found ma- 
terially different from that which is laid down in books. Its 
color is white ; grain, large ; highly crystalline ; present- 
ing a structure, very distinctly foliated--so much so that it 
can easily be chipped into little rhombs which are semi- 
translucent. There appear to be several ranges of it in 
this tewn——in most instances they take a course northeaster- 
ly and southwesterly, with very little if any inclination to 
the horizon—and they generally have the same external 
character. The country in which they lie is very obvious- 
ly a granite country, furnishing that rock in almost every va- 
riety. 
Arr. Il. Sketches of a tour in the counties of New-Haven 
and Litchfield in Connecticut, with notices of the Geology, 
Mineralogy and Scenery, Ge by the Enviror.—(From 
the papers of the American Geological ea) 
Tue following observations arose out of a journey wi- 
dertaken for other purposes and occupying only five days. 
The manner is more diffuse and popular than the sub- 
‘ject might strictly demand, but this course was adopted 
with the hope of alluring some degree of attention to the 
* Specimens both of the Granite and the Limestone which have been 
mentioned have been forwarded for your examination. Annexed you have 
a representation of the rock and its pillars as they are seen from the roaé 
and river, sketehed with a pencil on the spet 
