THE 
AMERICAN 
JOURNAL OF SCIENCE, &c. 
GEOLOGY, MINERALOGY, &c. 
Art. ].—Memoir on the New or Variegated Sandstone of the 
United States. By J. Fivcu, F. B.S. M.C.S. &e. 
To advance the study of Geology, it is requisite that rocks 
or formations, possessing similar characters, should be called 
by the same name, in whatever part of the surface of the 
earth they may be found. 
In the geological map of the United States of America, a 
formation, coloured blue, extending from New-York to Vir- 
ginia, has hitherto been called old red Sandstone. Some 
members of it appear to me to belong to a very different 
formation—to one much higher in the series—to the new or 
variegated Sandstone.* 
I have examined this rock in a great variety of positions, 
but it is best displayed at the quarries, one mile North West 
of the town of Newark, in New-Jersey, where there are ex- 
tensive excavations, which have been worked more than a 
century, and from whence New-York has been, and still is, 
supplied with large quantities of building stone. These 
quarries exhibit a nearly perpendicular section, which shows 
the following varieties. 
* In New-England, the old red Sandstone, so ably described by Mr. 
Mac vourg, is the basis of the formation but some of the upper strata, ap- 
pear to correspond with the views of Mr. Finch.—Ep. 
Vor. X.—No 2. 97 
