92 CONTRIBUTIONS TO DEVONIAN PALEONTOLOGY. [bull. 244 
COMMENTS ON THE PALEONTOLOGY OF THE HOLLOWING RUN 
SECTION. 
By H. S. Williams. 
The main fauna, ranging from zone 11 to 28 of this section, presents 
a general similarity to the fauna in the middle part (zones 10 to 33) of 
the Catawissa section. If the horizons in which Beticularia laevm 
first occurs be regarded as equivalent in the two sections, the 100-foot 
portion of the Catawissa section, including zones 21 to 26, is separated 
from the Beticularia Isevis zone by something over 300 feet, the corre- 
sponding 100-foot portion of the Hollowing Run section contains a- 
typical Ithaca fauna, and the central part of the typical fauna of the 
Ithaca member lies about the same distance above the conspicuous 
Beticularia Isevis zone at the foot of Fall Creek section at Ithaca. It 
is to be noted that Productella hallana occurs with Pugnax pugnus in 
zone 16, as is the case in the typical Ithaca fauna of Ithaca. a 
This upper fauna of the Hollowing Run section can be thus undoubt- 
edly correlated with the fauna of the Ithaca member of the Nunda 
(Portage) formation. The association with it of such forms as Glaam 
chonus, Buchiola speciosa, and Goniatites indicate the mingling of 
species of the typical Nunda sedimentation with the richer Ithaca: 
fauna. 
THE LEROY SECTION, BRADFORD COUNTY, PA. 
Leroy is in Bradford County, Pa., about 22 miles south of the New 
York line. It is about midway between the previously described Cata- 
wissa section and Ithaca, N. Y., but lies a few miles to the west of a 
north -south line connecting these points. Four sections in the vicinity 
of Leroy, which together exhibit nearly all of the outcropping beds to 
the Pennsylvanian series, have been carefully measured, and taken 
together are called the Leroy section. These subsections, which will 
be described separately, are the Gulf Brook, Granville Center, 
Towanda Narrows, and South Mountain sections. 
THE GULF BROOK SECTION. 
By E. M. Kindle. 
Gulf Brook enters the valley of Towanda Creek at Leroy, through 
a post-Glacial gorge which cuts directly across the strike of the Che- 
mung rocks, exposing a section which the State geologist of Pennsyl- 
vania has called "the best section of the formation that we have in 
Pennsylvania." a 
a Bull. U. S. Geol. Survey No. 3, pp. 18-19. 
f> Summary Final Rept. Second Pennsylvania Geol. Survey, vol. 2, p. 1448. 
