GEORGIA AND ALABAMA ORISKANY 323 



contact with all the older rocks thus far described [Middle Cambric to top of Cham- 

 plainic]. It consists of coarse ferruginous sandstone, in some places white, resem- 

 bling quartzite, and in others yellow or gray and weathering to incoherent beds 

 of sand. Beneath this sandstone and usually deeply covered by its debris are 

 shales, also variable in composition and appearance. . . . 



"A number of fossils have been found [by Mr Cooper Curtice] in these sand- 

 stones of Frog mountain [Cherokee county, Alabama]." They include Zaphrentis 

 (28109), Spirifer arenosus, S. murchisoni (28099), and Orthis (Rhipidomella) musculom f 

 " Concerning these fossils Mr Walcott says that all the specific determinations are 

 uncertain, but the horizon of the Oriskany sandstone is strongly suggested by the 

 general fades of the fauna."* 



"A few miles south of Cedartown, Georgia, the stratigraphic relations are shown 

 better than in the disturbed region about Frog mountain, though no fossils have 

 been collected. Resting on the Rockmart slate [Champlainic] is a bed of sand- 

 stone not more than 20 feet thick, and upon this is a fossiliferous chert." f 



On Armuchee creek, at the northeast end of Lavender mountain, in 

 Floyd count}?", adjoining the Alabama state line, Mr A. H. Brooks, of the 

 United States Geological Survey, gathered unmistakable 'Oriskany fos- 

 sils from chert beds, which contain the following species, as identified 

 by the writer : 



Orthis (Rhipidomella) musculosa Hall. Spirifer tribulis Hall. 28076. 



28078. Meristella cfr. walcotti Hall and Clarke. 

 Slropheodonta magnified Hall. 28077. 28074. 



Anoplotheca fimbria ta (H sill). 28075. A mboccelia umbonata (Conrad). 28073. 



ORISKANY OF CANADA 



Cayuga, Ontario. — In the region of Ca}'uga lake, New York, the Upper 

 Oriskany is sparing]}' present and is fossiliferous, but west of Ontario 

 county it is only present u in small lenticular patches," or in " nodules 

 of dark colored non-fossiliferous sandstone which hold the position and 

 preserve the characters of the Oriskany sandstone in other localities. "J 



The Oriskany sandstone is not again seen until some distance beyond 

 the Niagara river, in the province of Ontario, Canada, near Caj^uga. This 

 formation is described by Logan § as follows : 



" In the township of Oneida and North Cayuga . . . there are large ex- 

 posures of the [Oriskany] rock. It is composed of fine grains of white quartz, in 

 some parts so closely cemented as to assume the characters of a white, compact 

 quartzite. . . . The beds are massive, and from 6 inches to 6 feet thick. . . . 

 The greatest thickness of the mass may be about 25 feet, but, though now and then 

 attaining 10 feet, it seldom exceeds about 6, and it is frequently wanting between 

 the Waterlime series and the overlying Corniferous formation." 



*Bull. Geol. Soc. Amer., vol. 5, 1804, p. 470. 

 f Hayes : Amer. Jour. Sci , vol. 47, 1894, p. 237. 

 X Hall : Pal. N. Y., vol. iii, 1859, pp. 401- 

 l Geol. of Canada, 1863, p. 360. 



