222 TRANSACTIONS OF THE [May 21, 
The Chazy and Utica occur in similar relations on the Ver- 
mont side of the lake* at Fort Cassin and at Valcour.t 
Brainerd records} the occurrence of the Chazy in this vicinity, 
but no beds containing Maclurea magna are reported west of 
the outlet of Lake Champlain. 
The Chazy rock is much less siliceous than the Calciferous; of 
a gray-blue color, weathering lighter and sometimes with its 
lenticular layers of white dolomite, resembling the clay seams of 
some limestones. Two distinct sets of beds are noticeable. 
The lower series is dense, with rarely any fossils in the lower 
portion and with Maclurea magna, Zaphrentis, Strophomena, 
Orthoceras as fossils in the upper layers; and second an overly- 
ing series of lighter colored beds, showing a crystalline texture 
with abundant flinty dises of Solenopora compacta, encrinal 
stems, etc. 
Prof. Seely has distinguished an extensive series of beds at 
Beekman Station near Plattsburgh, N. Y.,§ and Prof. Whitfield 
has published a similar section from Ft. Cassin, Vermont,|j 
some of which may doubtless be correlated with the beds above 
mentioned. Hence the stratigraphy of the Chazy herein described 
may suffer revision upon a fuller study of the fossils. The for- 
mer series comprise the quarries at Essex and on Willsboro’ 
Point (where the latter series also appears on the surface). 
They also form ledges through the fields to the northwest of 
Essex; the upper series of beds occur on the shore at the head 
of Willsboro’ Bay,and all along the north side of the road run- 
ning southwest back from Essex. The latter are deeply seamed 
by perpendicular clefts several feet deep. Both sets of beds in 
these overlying relations are uncovered in a little quarry on the 
farm of Mr. Ross in Essex. 
I have analyzed stone from the lower beds of the Willsboro’ 
quarry, with the results given in column I. The same analysis 
is givenin column IT. with the carbonates calculated. For com- 
parison, is introduced in column III. an analysis of Chazy 
limestone by Boynton 4 (No. 44), also stated to be from Wills- 
boro’. And in column IV. a rather remarkable one from St. 
Lawrence Toll Gate, Montreal; ** analyst not stated. 
*E. Hircucock: Geology of Vermont, Vol. I. (1861), map I., ete. 
¢+ «. P WHITFIELD: Fossils in the Chazy at Ft. Cassin, Vt., Bull. Am. Mus. Nat. 
Hist., VIII.: 299. 
{ E. BratnerD: The Chazy Formation in the Champlain Valley, Bull. Geol. 
Soc. Amer. IL.: 293 and 300. 
§ Bull. Am. Mus. Nat. Hist., March, 1889, also December 28, 1886. 
|| Idem., VIII.: 295-299. 
qi Trans. N. Y. State Agri. Soe. XII. (1852): 801. 
** Geol. Survey Canada, Rept. progress for 1857, 190; Toronto (1858). 
