WELL RECORDS 375 



deserves mention. No evidence of inicont'orniity was discovered at the 

 top of this sandstone, and certainly there are no masses of sandstone 

 included in the limestone, altliongh much sand is mingled witli the 

 calcareous sediments for 2 or 3 feet above the true sandstone. 



F08SiLS FROM WALPOLE TOWNSHIP 



Among the common fossils of this sandstone are Centronella glans- 

 fagea Hall, Spirifer divaricatus Hall, Meristella hasuta (Conrad), Am- 

 phigenia elongata (Vanuxem), PentamereUa arata (Conrad), Iieticu- 

 Jar'm finihriata (Conrad), PhoUdostropliia iowaensis (Owen), Spirifer 

 macrothyris Hall, Spirifer duodenarius (Hall), Zaplirentis gigantea 

 Lesueur, Micheliiiia convexa d^Orbigny, Zaplirentis proUfica Billings, 

 Favosifes iurhinaius Billings, etcetera. This fauna is truly that of the 

 Onondaga limestone and in it was found none of the characteristic 

 Oriskan}^ species. 



WELL RECORDS 



Well records at Hagersville, about half way between the two localities 

 under discussion, give no evidence of sandstone at the base of the Onon- 

 daga, although some of the wells to the southwest do strike sandstone at 

 this horizon, while others do not. These outcrops of sandstone are, 

 therefore, not continuous and lie at different horizons, as their faunas 

 and stratigraphic relations show. Moreover, a mingling of the Oriskany 

 and Onondaga faunas at this locality does not exist. What seems to 

 have happened is that the Oriskany Sea withdrew entirely from Ontario 

 and that a land interval followed it. With the transgression of the 

 Onondaga Sea the Oriskany sandstone suffered severely from erosion, 

 and the arenaceous materials thus obtained were incorporated into the 

 lower layers of the Onondaga limestone. Locally, as at Springvale, this 

 sand was of sufficient quantity to form considerable beds of sandstone. 

 The subsequent changes which have increased the similarity of the two 

 deposits, namely, the formation of the quartzite-like masses, have prob- 

 ably been brouarht about at a much later date. 



^&' 



Conclusions 



T^ear Syracuse, Onondaga County, New York, there are numerous out- 

 crops of the Onondaga limestone and of the Oriskany sandstone. At 

 some of these places the basal portion of the Onondaga contains a con- 

 siderable amount of sand. The outcrop in the gorge just west of Manlius 

 shows a stratum between 2 and 3 feet in thickness, in the lower part of 

 which "the sand predominates over the lime, but toward the top the lime 



