Geology of southwestern New York. — Harris. 177 
no means in such abundance as did the series below. Moreover, 
a Pararca was found at this general horizon ; it was not in place 
but had evidently fallen from a ledge close by. 
Still higher, at an altitude of 370 feet above the road, the rocks 
become more arenaceous, are more heavily bedded, and yield but 
few fossil remains. Nevertheless, the few species here noted* 
are sufficient in themselves to determine the horizon of the beds 
that contain them as either the equivalent of the Panama con- 
glomerate or of beds that lie not far above it. In the Proceed- 
ings of the American Association, professor Hall remarks!; 
' ' In following the Chemung group in its exposures from Panama 
to the southwest, and beyond the limits of New York, we find 
the higher members to consist of a bluish, shaly sandstone con- 
taining great numbers of separated valves of Spirifera disjuncta, 
which bear evidence of having been drifted and worn before 
embedding. Associated with these water-worn and separated 
valves of Spirifer are shells or casts of Ptychopteria not dissimilar 
from the species abundant in the conglomerate of Panama. " 
According to Mr. F. A. Randall, the genus Ptychopteria occurs 
in the Warren section (see PI. vi) between the base of the ' ' Flat 
pebble conglomerate " and the " Impure limestone. " If, however, 
the correlation suggested on PI. vi, be correct, such forms of 
this genus as were found in the Pope Hollow section, may be ex- 
pected from the flaggy layers at least fifty feet above the last men- 
tioned stratum. 
The greatest altitude at which fossils were found in place was 
4.40 feet above the road. Here was noted a species of Ptychop- 
teria probably perlata, though of only half the dimensions of 
that species as figured by Hall, (X. Y. Geol. Surv. , Pal. vol. o, 
pt. 1, pi. 85, fig. 38). An external impression of Spirifera dis- 
juncta was seen in a loose fragment of the Pope Hollow con- 
glomerate. 
Concerning the conglomerate itself, little can here lie added to 
the description given by Carll in Rept. 1111. 
(3). Barren Series. This series has been so named from the 
^Ptychopteria thetis, T. (sp. size of thetis, but form of beecheri), P. 
(perlata in form), Spirifera dtejuncta (rare), Productella (rare), Avicu- 
lopccten dnplicuhtsf (concentric striation faint, visible only between 
the cos tie). 
fProc. A. A. A. S., xxxiii, 1884, p. 41G. 
14 
