AMERICAN 
JOURNAL OF SCIENCE, &c. 
SECOND EDITION. 
; —— 
GEOLOGY, MINERALOGY, TOPOGRAPHY, e-. 
+o 
Art. I. Hints on some of the Outlines of Geological Arrangement, 
with particular Reference to the System of Werner, na lettter to 
the Editor, from Wasam Macture, Esq. dated Paris, 22d 
August, 1818. 
INTRODUCTORY REMARKS. 
Some years since, during Mr. Maclure’s geological survey ot 
the United States, the editor had the pleasure of passing a few 
days, in company with that gentleman, in exploring the geol- 
ogy of the vicinity of New-Haven. . Near that town, junctions, 
on an extensive scale, between widely different formations, are 
to be observed. A radius of ten miles, with New-Haven for 
4 centre, will describe a circle within which the geological stu- 
dent may find (with the exception of formations, unquestiona- 
bly volcanic) most of the important rocks of the globe, and a 
radius of even six or seven miles will include the greater num- 
ber of these. At, and near the terminations of the primitive 
Tanges, there are rocks which appear to have, ina high de- 
gree, the characters of the transition class. Among them is the 
beautiful green marble of the Milford Hills, seven miles from 
: New-Haven. Mr. Maclure visited that district and even sug- 
Vor. 1....No. 3. 1 
