288 Forty-sixth Report on thb State Museum, 



Above the barren measures is a zone containing abundant fossils, 

 which has been called the ^^Paracyclas lirata " stage of the middle 

 Devonian fauna as traced above the horizon of the Genesee shale.* 



Stations 503 D. and E. and 504 A. are in this zone, but it is much 

 better exposed in the Susquehanna river valley near Oneonta. This 

 zone is evidently the Oneonta group of Conrad,f while Vanuxem 

 regarded it as belonging to the Ithaca group. J 



Later writers regard all of these upper shales and sandstones, to the 

 grays and reds above, as forming the closing part of the Hamilton 

 group,§ or at least as containing "modified stages of the Hamilton 

 fauna. II 



Following the ^^Paracyclas lirata stage " are the red and gray sand- 

 stones and shales of Vanuxem's Oneonta or Montrose group. ^ This 

 group or stage of rocks forms all of the high land between Butternut 

 creek and Otego river ; between Otego river and the Susquehanna 

 river and the high hills south of the Susquehanna river. 



* Proc. Am. Assoc. Adv. Sci., vol. xxxiv, p. 225; also chart. 

 t N. Y. Ann. Geol. Rept., 1841, pp. 31, 50 and 53. 

 X Geol. N. Y., Pt. m, p. 192. 



§ Science, vol i, p. 290 (Dec. 11, 1880); Pal. N. Y., vol. v, Pts. I, H, pp. 517-618. 

 I Proc. Am. Assoc. Adv. Sci., vol. xxxlv, pp. 225, 233-284, and chart. 



t N. Y. Ann. Geol. Rept., 1840, p. 381. See also Proc. Am, Assoc. Adv. Sci., vol. xxxir, pp. SSS, 

 226, 233, 234, and chart. 



