WILLIAMS 
KINDLE 
, ANI) ] CORRELATION OF HOLLOWING RUN SECTION. 91 
Zone 29 of Hollowing Run section {HSJ^ A). — Twenty feet of tough 
olive sandy shale, apparently barren of fossils, terminate the section. 
Exposures cease before the " red beds' 1 are reached. South of 
Hollowing Run no important outcrops appear until the axis of Little 
Mountain is passed, when the red Catskill beds, on the south side of 
the syncline, are seen dipping to the north. 
FORMATIONAL CORRELATION OF HOLLOWING RUN SECTION. 
By E. M. Kindle. 
The bearing of the detailed paleontological data given in the preced- 
ing pages on the correlation of the section may be briefly summed up. 
Zones 11 and 12 of the writer's section represent a portion of No. 8 
of White's section, which he called the "Genesee shale." These beds 
have been found to hold a fauna which is distinctively Nunda. The 
physical characteristics of the beds, which are hard and slaty instead 
of fissile, confirm the evidence of the fossils and indicate that the lower 
beds of the section above the concealed interval (No. 9) should be 
referred to the Nunda formation. 
The beds above the Genesee shale of White were referred by him 
to the Chemung. 65 The supposed discovery of Spirifer disjunctm in 
the section was apparently the reason for this correlation. A careful 
examination of every part of the section by the writer failed to dis- 
cover any trace of that species. Since it was reported to occur in 
great numbers, it could hardly have been overlooked. The fauna 
which was secured at this horizon has such a distinctly Ithaca charac- 
ter that it is nearly certain that the determination of the form listed 
as Sp. disjunctm by White was an error. The presence of such 
species as Sp. pennatus var. posterus, Productella */>eclosa, and Stro- 
pheodonta (Leptosirophia) inter •strialis, together with the absence of 
characteristic Chemung species, affords satisfactory and precise data for 
correlating with the Nunda (Portage) formation, including the Ithaca 
member, all of this section tying above the Genesee, which appears to 
belong in the concealed interval. 
No very striking differences appear between this section and the 
Catawissa section. On the contrary, there are some interesting 
similarities. The comparatively rare forms Reticularia laevis and 
Pugnax pugnus are found in both sections. A few recurrent Hamilton 
species occur in each. Cyrtina harnlltontnsls is common in both sec- 
tions. No notable geographical changes in the faunas appear, both 
sections ^longing to the same faunal province. 
a Second Pennsylvania Geol. Survey, Kept., G 7, p. 360. 
