prossek] EXTENSION OF CHEMUNG FORMATION. 9 
carefully studied the exposures along the valley of the Unadilla River 
to New Berlin and then across the hills to Oneonta, but failed to find 
any evidence of the G-enesee black shale or its fauna. Near Smyrna 
were found black argillaceous shales some 20 feet in thickness. 1 
No. 1475 CG. — Bluish, arenaceous shales by the roadside, just above 
the Delaware, Lackawanna and Western Railroad crossing, about one- 
half mile south of Spragueville. The rock is rather micaceous, and is 
composed of quite coarse arenaceous sliales with some sandstone and 
thin shaly layers in which are fossils, so that, lithologically considered, 
it is quite different from the darker and more argillaceous shales of the 
so-called Genesee below. 
Fauna of No. 1475 C6. 
Tropirtoleptus carinatns (Con. ) Hall (rr) 
Hoaialouotus dekayi (Green) Emm (rr) 
Paracyclas lirata (Con.) Hall (rr) 
Palaioueilo maxima (Con. ) Hall (rr) 
Leptodesma rogersi Hall (?) (rr) 
There are three specimens which agree well with some of the figures of 
the above species, and a fourth specimen is narrower, more oblique, and 
resembles somewhat fig. 13, PI. xxr of L. spmigerum (Con.) Hall. Prof. 
Hall says, "specific distinction is not always apparent" (Geoi. Surv. N. 
Y., Paleontology, Vol. v, Pt. i, Lamellibranchiata, I, p. 177). 
Spir ifera mesacostalis Hall (r) 
Pleurotomaria sp „ (r) 
Orthoceras sp .• (rr) 
Goniatites sp , „ (rr) 
These fossils are from the lower part of what Prof. White has described 
and mapped as Chemung, and from the locality which is mentioned in 
his description of Stroud Township. The professor wrote: " Along 
the county road, about one-half mile below Spragueville, the Chemung 
rocks are seen in cliffs of gray fine-grained sandstone, quite fossilif- 
erous." 2 The fauna is not that of the typical Chemung, but rather 
appears to be that of the Ithaca group which forms at Ithaca, N. Y., the 
middle of the Portage stage. Bearing upon this question is the state- 
ment of Prof. James Hall to the Geological Society at Rochester, that 
he believed u the Chemung formation went no farther east than Dela- 
ware County [New York]." 5 Prof. White mentions u Spirifer dis- 
junctm" A as occurring in the Chemung of northeastern Pennsylvania. 
Very careful search was given to the rocks called Chemung, as well as 
to the overlying ones, yet no specimen of this well-known Chemung 
species was found. In places numerous specimens of Spirifcra mesastri- 
alis Hall were found, which on hasty examination might be mistaken 
for the typical Chemung species. 
No. 1475 C7.— On the third hill below Spragueville, to the east of the 
1 Proc. Am. Asso. Adv. Science, Vol. XXXVI, p. 210. 
2 G 6 , p. 272. 
3 As reported in the Rochester Post Express, August 10, 1892. 
« Ibid., p. 105. 
