WILLIAMS AND 
KINDLE. 
CORRELATION OF LEROY SECTION. 109 
The Chemung fauna continues for 800 feet above the lowest reddish 
beds. Its highest appearance is in beds which lithologically are of a 
decided Catskill type. Catskill fishes are found in the red shales after 
the Chemung fauna has entirely disappeared. These remains, how- 
ever, do not continue to the upper limit of the Catskill type of sedi- 
ments. 
After the disappearance of Devonian fossils from the Leroy section 
the beds are entirely barren, so that there are no paleontological data 
for drawing the line between the Devonian and Carboniferous. In the 
absence of definite paleontological evidence the Devono-Carboniferous 
line may be drawn tentatively between divisions four and five of the 
generalized section, which corresponds to the base of the Oswayo — 
the Pocono of the Pennsylvania survey. The evidence of sections 
farther west, to be described later, seems to favor this correlation. 
COMMENTS ON CORRELATION OF THE LEROY SECTION. 
By H. S. Williams. 
The first zone paleontologically includes the faunules 1 to 6 with 
Pholadella radiata and recalls the early stage of the Chemung as it 
appears in the Ithaca and Waverly quadrangles of New York, with a 
recurrent Hamilton fauna, and before the Chemung fauna is repre- 
sented in full force. 
From 7 up to 39 inclusive is a zone holding the Stropheodonta 
(Douvillina) mucronata fauna with Delthyris mesicostalis, Spirifer 
mesistrialis, and Dalmanella carinata, but without Spirifer disjunctus; 
while above, from faunule 43 to the top, Spirifer disjunctus occurs 
abundantly in almost all the fossiliferous zones, but the other spirifers 
are wanting and the pelecypods are rare compared with their frequent 
appearance in the lower zone. 
It is probable that the first zone, including the lower 600 feet of 
this section, represents the fossiliferous zone which was called " Lower 
Chemung fauna" in 1884, a while the second zone represents the " typi- 
cal Chemung" of that classification and the 1,100 feet of sediment 
may carry the strata up as high or higher than the horizon where the 
red Catskill type of sedimentation first appears in the Bradford 
County section at Ulster. 6 
The prominence of the calcareous beds, the dominance of Cryp- 
tonella in some zones, and the fish fauna are conspicuous features of 
this upper zone. 
a Trans. Am. Inst. Min.Eng., vol. 16, p. 946. Also quoted in Doctor Kindle's paper on the Relation of 
the fauna of the Ithaca group to the faunas of the Portage and Chemung, Bull. Am. Paleontology, 
vol. 2, 1896, p. 9. 
&On the fossil faunas of the upper Devonian along the meridian of 76° 30' from Tompkins County, 
N. Y., to Bradford County, Pa: Bull. U. S. Geol. Survey No. 3, p. 27. 
Bull. 244—05 8 
