q 
Fal 
7 
PF. 
Geology and Mineralogy of « part of Massachusetts, &e. 21 
ye te 7. TRANSITION LIMESTONE. 
eee. ES + 
Metalliferous Limestone. Eaton.* 
Colored light brown. 
This Limestone forms 
through | ‘eee vo Calis mbi 
uve _limeston coun 
gle icon mt ained ; but it continues 
he hwards beyond the limit of the section, as Prof. “7 
believes, to Lake Champlain.* It is distinguished 
somewhat earthy fracture, and its tendency towards the = 
x structure ; and is associated to some extent with quartz. 
hough some of it differs but little from the newest primi- 
tive in Berkshire Co., yet its connexion with that which 
possesses the preceding characters has convinced geologists 
that it belongs to the transition series. It is doubtless the 
oldest transition rock’ in this section of the country. The 
limestone of Hoosack, Petersburgh, Lebanon, Canaan, 
Hillsdale, &c. belongs to a stratum. It occurs in beds 
also still nearer the Hudso 
The mineral spring at "New Lpthnen is in this rock. 
The latitude os rp / Spring was 08 by Rittenhouse in _ 
iN, The spring 
1787, to be 4 is 
is ston’ 70° Ties ae 
8. TRANSITION ARGILLITE. 
Colored Carmine. 
This rock lies next west of the transition i 
joins upon it. It is much less shining than prim 
lite, and is more full of seams, ee 2 in various directions. 
It resembles the argillite along the son. Between the 
two, indeed, lies the gray wacke ten miles in width. But 
as strata of argillite occur in the gray wacke near the Hud- 
son, and occasionally farther east, which differ not essen- 
* Geological and Ag. Survey of Rensselaer County. “See also Mr. 
Barnes’ Section of = Canaan Mountain, Am. Journ. Vol. V. p. 10, for 
some notices of this 
