130 CONTRIBUTIONS TO DEVONIAN PALEONTOLOGY. [bull.2441 
any of the faurmles reported. Prominent among the associates of 
Strophonella caelata are Stropheodonta (Douvillina) mucronata, and 
in the lowest faunule of Tioga section, also Stroph. {Leptostrophim 
perplana var. nervosa, and Stropheodonta {Douvillina) inmquistriatdk 
Spirifer disjunctus, and Atrypa spinosa, none of which species arel 
associated with Athyris angelica. 
In the higher zone common associates with Athyris are DeWtyris 
mesicostalis, and Camarotcechia contracta, neither of which is seen 
associated with Strophonella. Schizophoria striatula, Prodiwtella 
lachrymosa, and Orthothetes chemungensis are common to both faunas. 
Athyris angelica is rare in the eastern extension of the Chemung 
fauna, but whether its absence is associated with the fact that the 
higher Chemung faunas are cut off in the east by the red beds, or 
because of limited geographical range during the same portion of 
time, is not evident from the facts at hand. As was pointed out 
in Bull. U. S. Geol. Survey No. 41, Athyris angelica is a prevailing 
species in the upper Chemung horizons of the Genesee Valley sections. 
In the survey of that region, Strophonella caelata was not discovered. 
But it is also to be noted that Spirifer disjunctus is a very common 
species in the typical Chemung fauna of western New York, and is \ 
there frequently associated with Athyris. It is not a very frequently 
occurring species in the typical Chemung beds of the more eastern 
sections, although it is very abundant in some zones. 
The faunal indications of these Tioga County sections therefore 
favor the view that both the Strophonella and Athyris zones are welfl 
up in the Chemung formation; and, according to the opinion of the 
writer, are to be correlated stratigraphically with beds occupying the 
higher hilltops of the Waverly quadrangle, above the fossiliferous 
zones of the cliffs along Chemung River at Chemung Narrows and 
WaveiTy. Fuller collections of fossils from this and neighboring 
regions will throw light upon this problem. 
COMMENTS ON THE CORRELATION OF THE SECTIONS OF^ 
BRADFORD AND TIOGA COUNTIES, PA. 
By H. S. Williams. 
In PL IV the several sections of Bradford and Tioga counties, , 
measured by E. M. Kindle, the faunules of which are discussed in 
the previous pages, are arranged according to the evidence fur- 
nished by the contained fossils. Placed to the left of them is the 
section (generalized) of the Tioga folio as prepared by M. L. Fuller. 
The sections are all drawn to same scale, and the lower ones are cor- 
related according to contained fossils, while those at the top of the 
series are correlated by the beds supposed to represent the Mauch 
Chunk and Sharon formations. 
