224 TRANSACTIONS OF THE [may 21, 
The stone has also been used in several Albany and Troy 
churches.* 
The shore exposure of the Chazy at Essex is on the headland 
known as Bluff Point, in the relations shown in the section at the 
base of plate VI. The Chazy is faulted on the north side against 
the Trenton and on the south against the Utica shale. The 
former fault runs northwest, while the latter, which is about 
fifteen feet wide, as traced half a mile back to the south of the 
quarries, strikes N. 60° E.,so that the two faults in projection 
form an obtuse angle with each other.t The fault and accom- 
panying uplift are figured by Emmons, who devotes several pages 
to its discussion.{ The Utica shale§ is sharply drawn down 
upon its southern face, forming polished “slickensides.” The 
extreme bending is of limited extent; the shales south of the 
fault dipping only 15° 8. E. with strike N. 60° E., and the angle 
of the dip gradually lessens southward forthe the next half mile 
and finally becomes horizontal or only 2°-38° 8., forming an es- 
carpment 4-6 feet high, extending along thelakeside. The low- 
er layers of the Chazy at the end of Bluff Point include a three- 
foot seam packed with Orthis platys, Billings, but containing 
no Maclureas. The Chazy extends around to the northwest of 
the Trenton however, following the supposed fault. On the north 
side of the point ledges with Maclurea magna occur at thirty-five 
feet elevation. They also contain abed densely filled with glob- 
ular masses of concentric structure, about one quarter of an inch 
in diameter, containing as nuclei, minute lamellar foraminiferal 
skeletons. The height to the top of the bluff is thirty feet. At 
tifty feet inan open field Obolella prima occurs (52 on map), then 
crossing the roadway, about forty feet west of it and at sixty- 
five above lake level the first Maclureas appear together with 
imperfect remains of Buthotrephis. Thesame ledges continue up 
the hill, reaching a maximum altitude of ninety to one hundred 
feet in Parkhill’s quarries, about half a mile from shore. There 
are two quarries; the lower 75 to 90 feet above the lake, the 
upper 90 to 100; and they represent different beds in the Chazy. 
The dip in the lower quarry is 10°-12° N., strike N. 60 H., in 
the upper quarry 14° N.W., and N. 25° E.; the fossils are chief- 
ly in the lower bed, the upper being more compact. The fossils 
* JoHNn C. Smock: Bull. N. Y. State Museum, Vol. I., No. 3 (March 1888), pp. 
102-103. Also, Vol. II., No. '0 (Sept., 1890), p. 242, 327 and 331. G. P. MERRILL, 
Rept. Smithsonian Inst. (1885-6), Part II., p. 517 and 569. 
+ Discussed in a vaper read by Mr. Gilbert van Ingen before the N. Y. Acad. 
Sci., Oct., 1893, unpublished. 
{ E, Emmons: Geol. of the Second District, pp. 272-276. 
§ These are Utica, not Hudson River shales, as they were called by Emmons, 
Mr. van Ingen having found abundant specimens of Zriarthrus Beckvi, char- 
acteristic of the former. 
