72 PENNSYLVANIA AND NEW YORK DEVONIAN. [bull. 120. 
has collected them in the same shales, in association with other char 
acteristic Hamilton species.' 
The Tnlly limestone horizon was described as follows by Prof. White : 
u A great coral bed is found directly under the Genesee shale at many 
localities in the district, corals, shells, and crinoids being- often so 
abundant as to constitute it an impure limestone." The following species 
were reported : " Zaphrentis Rafinesquii, Z. gigantea, Heliophyllum Halli, 
together with several species of Syringopora, and other forms that I 
could not determine." Again: "There can be little doubt that this 
stratum represents the Tully limestone horizon of the New York Reports, 
and it thus becomes a valuable guide in correlating and classifying the 
rocks of the district." 2 It has already been pointed out that this zone 
does not lithologically resemble the Tully limestone of central New York, 
while none of the fossils mentioned by Prof. White are considered 
Tully species. 3 
In the prefatory letter to Prof. White's report of the following year, 
Prof. Lesley stated, "The presence of the Tally limestone, beneath the 
Genesee slates, in this part of Pennsylvania [central] is demonstrated." 4 
As far as reported by Prof. White, the evidence in favor of this 
demonstration is as follows : In the account of the Devonian rocks of 
this district, the Tully limestone is described in the section on Little 
Fishing Creek, Columbia County, as "a series of dull gray and bluish 
gray impure limestones, weathering with a huffish tint, and often pre- 
senting a slaty appearance; usually quite fossil iferous, the following 
species being frequently present : Amboccelia umbonata, /Spirifera ziczac, 
IS. fimbriata, Or this vanuxemi, Atrypa reticularis, Chonetes sctigerus, 
Phacops rana, Dalmanites calliteles, Platyceras, sp ?, thickness 50 feet." 5 
Of the above list of fossils, five 6 of them occur in the Tally lime- 
stone of New York; but none of the characteristic Tully species were 
'The above remarks in reference to the so-called Genesee of eastern Pennsylvania are not intended 
to apply to the horizon termed the Genesee group by Prof. Claypole in Perry County, in southern cen- 
tral Pennsylvania, The correlations of Prof. Claypole considered carefully the paleontology of the 
formations, and are the most accurate of the Pennsylvania survey. His description of the formation 
as "black, almost unfossiliferous shale,'" agrees more closely with the New York shales, and the 
Styliola fissurella Hall (F 2 , p. GO), which lie reports is a common Genesee fossil, although it occurs in 
the Marcellus, Hamilton, Portage, and Ithaca stages. 
2G 6 , pp. 109,110. 
3 See list of Tnlly species by Dr. H. S. Williams, in Bull. Geol. Soc. Am., Vol. I, pp. 490, 491. 
Neither do they appear in the list of Tully fossils by Prof. S. G. Williams in Sixth Ann. Sept. State 
Geol. [New York], 1887, p. 20. This list included some species usually regarded as not belonging to 
the Tully limestone, and for comment on this point see Bull. Geol. Soc, Vol. I, pp. 496, 497, and f. n. 
on p. 496. 
4 G 7 , p. VI. 
<Tbid., p. 75, The specific identification of this list is supposed to be by Prof. Claypole, andon p. 289 
the same species are reported as identified by Prof. Claypole, with the exception of Orthis vanuxemi 
and Dalmanites calliteles, from the section along the Susquehanna River between Catawissa and 
Bloomsburg ferry. Columbia County. The Fishing Creek section is again mentioned by Prof. White, 
who says, " The Tully limestone, No. 15, has the same ashen-gray cast with a tinge of buff on its 
weathered surface, and dark-blue color within, as everywhere else in the district. It is alsoiossili- 
ferous here, and in it were seen Phacops rctna, Dalmanites calliteles, Amboccelia umbonata, and others 
not determined M (pp. 228, 229). 
6 Amboccelia umbonata, Spirifera fimbriata, Atrypa reticularis, Phacops rana, and Dalmanites calli- 
teles. (See list of important Tully species by Dr. H. S. Williams, in Bui. Geol. Soc Am., Vol. I. p. 490). 
