O. Loew on Wheelerite, a new Fossil Resin. 571 
considerable lithological similarity between the rocks along the 
isbon and Swift Water sections. 
Our general impression of the age of this new series is that 
it is allied to the Helderberg. The Cods group disappeared 
finally about two miles below the Lisbon section, so that the 
Swift Water series lies contiguous to gneiss of a very ancient 
period for five or six miles. Were the presence of chlorite an 
exerted so forcibly in New Hampshire, that inversion is the 
rule rather than the exception. There is no time to present a 
formal proof of this statement at present. 
Conclusions. 
Briefly stated, the following conclusions respecting the rela- 
tions of these Ammonoosuc Helderberg strata seem t 
sustained, 
1. The fossiliferous limestones belong to the Lower Helder- 
erg. 
2. The H 
thousand feet thick, and is composed chiefly of limestones, 
hornblende 
4. The Swift Water series seems more nearly related to the 
Helderberg than any of the other formations. __ 
5. The Helderberg rocks are the newest in this terrane, and 
the most modern that have yet been discovered in the State. 
I propose next to describe the Helderberg strata and asso- 
ciated rocks of Hinsdale, N. H., and Vernon, Vt., as they con- 
tinue northerly from Bernardston and Northfield, Mass. 
Arr, LIU.— On Wheelerite, a new Fossil Resin ; by O. Loew. 
