86 CONTRIBUTIONS TO DEVONIAN PALEONTOLOGY. [bi li '244. 
upper fauna, associated with the absence of the Chemung species of 
P/oductella, Orthis, Spirifer, and Delthyris, indicate a continuation, 
of the Ithaca fauna up through the zone, called upper Portage at] 
Ithaca, where it was found to be nearly barren and represented only] 
by recurrent Nunda (Portage) species. 
This combination of species, seen in the upper part of the Catawissa 
section, is in harmony with the theory that the income of the western 
fauna was associated with the movements of the Nunda (Portage) sedi- 
ments and fauna, while the Ithaca fauna was associated more intimately 
with the shif tings of the fauna of the Hamilton and is purer to the east,] 
and is more restricted, both in species and in range, as it is followed 
westward across the States of Pennsylvania and New York. 
Regarding the representatives of the western interior fauna, it may 
be said that, according to the present evidences, the Reticidaria wasl 
the first to appear in this eastern area; then came Pugnax and J*ro-\ 
ductella Indiana, and at a still later incursion, Strophonella and Spirm 
fer disjunctus were added. 
It will be observed that species Ectenodesma birostratwn and Glyp\ 
todesma erectum and two species of Bellerophon also appear in these 
upper faunules. 
But. as Doctor Kindle has already noted, throughout this whole 
fossiliferous zone of the Catawissa section, up to the appearance of 
the characteristic red sediment of the Catskills, no characteristic Che- 
mung species have been discovered. Using the Ithaca section as a,] 
standard, the Catawissa section, up to zone 40 (by the fossils), and pre- 
sumably up to the base of the red bed 43, must be correlated with the 
Hamilton, Genesee, and Nunda (including the Ithaca member in the' 
hitter) formations/' Faunally the evidence of the Chemung formation 
must be looked for in the still higher strata. 
THE HOLLOWING RUN SECTION, NORTHUMBERLAND 
COUNTY, PA. 
DESCRIPTION. 
By E. M. Kindle. 
A second section was selected for detailed study on Susquehanna 
River, 25 miles southwest of the Catawissa section. 
The Pennsylvania survey, in reporting upon this section, announced 
the occurrence in it of Spirifer disjunctus "in great numbers," 6 and; 
correlated all the beds above the u Genesee" as "Chemung." This 
particular section was subjected to investigation partly in order to test 
«The name "Nunda formation," including the Ithaca member, has been adopted in the Watkins 
Glen folio (now in preparation) to designate what has heretofore been called the Portage, or 
Nunda, group. November, 1901. H. S. W. 
b Second Pennsylvania Geol. Survey Kept., G 7, p. 35b. 
