342 The Upper Devonian Deposits of Maryland 



as intervening between the upper Portage rock and that group." ^ The 

 following year Professor Hall reported on the geology of Erie County and 

 described the terrains just mentioned under the headings of Casliaqua 

 shale, Gardeau group and Portage group." In Vanuxein's Final Eeport 

 of the Third District the Cashaqua shale, Gardeau and Portage groups, 

 and Sherburne flagstone and shale of the Annual Eeports were combined 

 to form the Portage or Nunda group.' Hall's Pinal Eeport of the Fourth 

 District, published the following year, contained the same classification." 

 The term Nunda, from the former name of the township which had been 

 changed to Portage, where the rocks of the " group " are finely shown on 

 the banks of the Genesee Eiver, was soon abandoned although its reten- 

 tion would have avoided confusion since Professor Hall first applied 

 the name Portage to the mass of sandstones in the upper part of the 

 " group." The rocks deposited during Portage time in the central and 

 eastern parts of New York have local facies and have received special 

 names. 



In the first place in the meridian of Canandaigua Lake Dr. J. M. 

 Clarke found, on studying the faunas of the Cashaqua shales and Gardeau 

 shales and flags, that they were closely related to that of the Genesee 

 shale and he proposed the name Naples beds or shales for these two 

 lower divisions of the Portage.^ In another paper published the same 

 year Dr. Clarke stated that in Ontario County the Cnshaqua shales and 

 the Gardeau shales and sandstones are both lithologically and palaeonto- 

 logically a single group to which has been applied the name Naples 

 shales.° Finally, in 1891, it was stated by Dr. Clarke that he used the 

 term Naples beds for the subdivisions of the Portage which had been 

 called the Cashaqua and Gardeau and to their faunal contents he applied 

 the name Naples fauna.' In 1898, Dr. Clarke called attention to the 

 fact that in the section west of Ontario County the heavy bedded Portage 



^Ibid., p. 392. 



= 5th An. Rep., ibid. (Assembly Doc. No. 150, 1841), pp. 165, 166. 



^ Geol. N. Y., Pt. Ill, 1842, p. 172. 



*Ibid., Pt. IV, p. 224. 



''Bull. U. S. Geol. Surv., No. 16, 1885. p. 36, f. n. 



"4tli Rep. State Geologist [N. Y.], p. 20, f. n. 



' Amer. Geol., Vol. 8, p. 93. 



