' ' Geology of Seis^eca County. ' 125 



Williams, H. S. — On the Fossil Faunas of the Upper Devonian, 



along the meridian of 76° 30' from Tompkins county, ^N". Y., 



to Bradford county, Penn. Bull. U. S. Geol. Survey, No. 3. 

 Id. — On the Fossil Faunas of the Upper Devonian — the Genesee 



Section. Bull. U. S. Geol. Survey, No. 41. 

 Williams, S. G. — The Westward Extension of Kocks of Lower 



Helderberg Age in New York. Amer. Jour. Sci., vol. 31, p. 



139. 

 Id. — Dip of Tully Limestone. Amer. Jour. Sci., vol. 26, p. 303. 

 Id.. — The TuUy Limestone, its distribution and its known fossils. 



N. Y. Assembly Document, No. 72, 1887. (Contributed to 



the Eeport of the State Geologist for 1886.) 

 Id. — Geological Eelations of the Gypsum Deposits in Cayuga 

 . county, N. Y. Am. Jour. Sci., vol. 30, p. 212. 



