Report of the State Geologist. 287 



11. Chonetes coronata, Cod. 



12. Palceoneilo eniarginataj Con. (?)^ 



13. Niicula corhuliformis. Hall (?). 



The stratigraphic results of this study may be summarized in the fol- 

 lowing manner : 



The Unadilla section commences in Corniferous limestone at Paris 

 Hill, and the last exposures of the limestone are seen just east of 

 Babcock Hill P. O. station, 496 B. 



The high hill north-east of Bridgewater, station 497 A, is composed 

 principally of Marcellus shales, with transitional shales forming the 

 summit of the hill. A statement similar to the above may be made in 

 regard to the low hill, 497 B, south-west of West Winfield, which is 

 the most southern exposure of typical Marcellus shale. 



At Unadilla Forks undoubted Hamilton shales and sandstones are 

 found on Markham mountain. From the last station to 583 A in the 

 northeastern part of Pittsfield, near New Berlin village, there is an 

 alternation of coarse or fine shales with thin sandstones, all containing 

 characteristic eastern Hamilton faunas. The fossils are not so abundant 

 either in number of species or specimens as in the Cayuga section of the 

 Hamilton. The rock is also much more arenaceous in the Unadilla sec- 

 tion, very little of the shale being so fine or argillaceous as that of 

 Cayuga lake. The encrinal limestone of the Hamilton, the Tully lime- 

 stone and the Genesee shale were not seen, although Vanuxem men- 

 tioned Genesee shale at New Berlin.* 



The f ossilif erous outcrops in the river valley at New Berlin were 

 regarded by the State Geologist of that district as the easternmost 

 Hamilton exposure; the higher rocks being considered by him as the 

 equivalent of the Portage and Ithaca groups. f 



Succeeding the New Berlin fauna, station 503 A, there is a con- 

 siderable thickness of blue shales and sandstones which are almost non- 

 f ossiliferous. In places the sandstone attains a thickness and regularity 

 of bedding suflicient for quarrying. These shales and sandstones form 

 all the long Pittsfield hill, except its summit or include stations 503 B 

 and C, and probably 504 B and C of Morris township. This zone is 

 regarded by the writer as the eastern continuation of the Sherburne 

 sandstones and shales of the Annual Report. I 



* Geol. N. Y. Pt. iu, p. 292. 



+ Ibid, p. 292. 



X N. T. Ann. Geol. Kept, 1840, p. 381 ; Geol. N. Y. Pt. ili, pp. 170-2 and 292-3. Since this thegig 

 wag written I have published articles confirming this correlation. See Proc. Am. Assoc. Adv. Sci. 

 vol. 3cxxvi, p. 210; also Am. Jour. Sci. vol. xlvi, p. 312. 



