322 C. SCHUCHERT — LOWER HELDERBERG-ORISKANY FORMATIONS 



.22 ^ 



•? a? 

 o 'aJ 



C 



c 



OS 

 J* . 



co <d 



^ — — 



Stropheodonla (Leplostrophia) perplana (Conrad). 26945. 



Orthothdes woolworthanw Hall. 26947 



Anoplia nucleate Hall. 26946 



Cyrtina affirm Billings. 26948 



Metaplasia pyxidata Hall. 26951 



Spirifcr hemlci/clus Meek and Worthen. 26949 



" tribulis Hall. 26953 



" worthenanus Schuchert. 26950 



Anoplotheca flabellites (Conrad). 26954 



Meristella Ixvis (Vannxem). 2(5958 



" sp. nndet. 26857 



Atrypa reticularis Linne. 26959 



Eatonia peculiaris (Conrad). 26961 



Amphigenia curia Meek and Worthen ? 26962 



Rensselxria ovoides (Eaton) ? 26964 



Megalanteris condoni (McChesney). 26963 



Tentaculites acuta Hall. 26965 



A vicula cfr. obscura Hall. 26966 



Actinojdcria cfr. textilis Hall. 26967 



Platyceras magnificum Hall ? 26069 



( Orthonychia) tortuosum { Hall ) ? 26968 



Diaphorosloma turbinata (Hall). 26970 



Strophostylus (?) cancellatus Meek and Worthen. 26971 . 



Phacops cristata Hall. 26973 



Ostracoda 26972 



x 

 x 



X 

 X 

 X 

 X 



H 



X 



Total, 32 species 24 







X 

 X 

 X 



() 



X 

 X 



X 

 X 



() 



20 



GEORGIA AND ALABAMA OMSK A XV 



It hiis been stated that the Oriskany thins out rapidly in Virginia 

 toward the Tennessee state line, and the thickness is given as about 40 

 feet. Nothing is known of this formation in eastern Tennessee, but it is 

 present in the western part of the state as a chert horizon not less than 

 60 feet thick. In Flo} r d county, Georgia, and in Cherokee county, Ala- 

 bama, the Oriskany is again present, having a thickness of not more 

 than 20 feet. It here bears the name of l< Frog Mountain sandstone,'* 

 and is described by Mr C. W. Hayes* as follows: 



"A few miles southwest of the region mapped [Coosa valley of Georgia and 

 Alabama] the Rockmart slate is overlain by a thin bed of white quartzose sand- 

 stone, and this by fossiliferous chert. . . . There are between Indian and 

 Weisner mountains several small areas occupied by a formation which comes in 



* Hull. (ieol. Soc. Amer., vol. 5, 18!»4, p. 470. 



