46 The American Geologist. .Jamiiuy, i8t<7 
Gkologt of C'HAzy Village. 
The classitication of the Champlain division — called lirst 
by Sedgwick Cambrian and afterward Upper Cambrian, and 
by some Lower Silurian and Ordovieian — was made by Dr. E. 
Emmons, and a full description given by him in his final lie- 
port of the Second District of the (ieological Survey of New 
York, pp. 102-122, Albany, 1842. The village of Chazy with 
its environs on lake Champlain was taken as a typical place 
for the section, and many geologists have been there since, 
visiting and studying the fine section, showing all the strata 
from the Potsdam sandstone to the Utica slates. Here is a 
resume of the section as I took it on several occasions, extend- 
ing from 1849 to 1863. In discordance on the Potsdam — 
southwest of the village of Chazy — we see about 250 feet of 
Calciferous sandrock. containing only four or tive species of 
fossils, such as Orthis. Strophotneoa, Scalites and numerous 
fragments of crinoids. 
Above it we have the Chazy limestone; about two hundred 
feet in thickness, containing a quantity of fossils, such as 
Maclurea magna, BeUerophon, Asaph us, Stenopora, Ortho- 
ceras, Uhynchonella, crinoids, stems, etc. 
Then come the Birdseye limestone and Black River for- 
mation, called also Black Marble of Isle la Motte ; thick- 
ness about forty feet, containing fossils belonging to /.s*o^eZ?^6-, 
Orthoceras, Ilaclicrea, Lepta'na, etc. 
Above it we have a fine development of a blue limestone, 
known as the Trenton limestone, four hundred feet thick, 
containing a very large number of fossils such as fragments 
of the large Isotelus (jigas, Calymene, Trirmcleus, Enompha- 
lus, Murchisonia, Aviciila, BeUerophon, Orthis, Lepta'na. 
Athrypa, etc. 
Finally, we have resting on the Trenton the Utica slates 
and Lorraine shales, with a thickness of about two hundred 
feet, containing in great abundance Triarthrus heckii on the 
shores of the lake at Rouse's Point and all over the Alburgh 
peninsula. 
Tabular Vieio of the Champlain system at Chazy a.nd Vicinity. 
Utica and Lorraine slates and shales 200 feet 
Trenton Limestone .400 " 
Black River and Birdseye Limestone 40 " 
Chazy Limestone 200 " 
Calciferous Sandrock 250 ' ' 
