26 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



FAUNA OF THE CEDARIA ZONE 

 Fossils of the Cedaria zone occur in the uppermost portion of the 

 Maryville limestone (only in the Roger sville area) and in the basal 

 part of the Nolichucky formation. At all the localities studied, an un- 

 fossiliferous interval in the Nolichucky shale separates the uppermost 

 beds carrying a Cedaria fauna from the lowermost beds holding a 

 Crepicephalus zone fauna. Hence assemblages transitional between 

 the two faunizones, as reported by Lochman and Duncan (1944) 

 from Montana and Palmer (1954) from Texas, have not been ob- 

 served. 



The oldest Upper Cambrian faunule seems to be the one occurring 

 in the uppermost 10-30 feet of the Maryville limestone in the Rogers- 

 ville outcrop belt. The corresponding interval was examined at several 

 other localities but yielded no fossils. Collections were made at several 

 localities in the vicinity of Roger sville (author's collections cnc/1 to 

 cnc/7; U.S.N.M. localities 102a, 123a). The species known from these 

 beds are listed below. An asterisk preceding the name indicates that 

 the types were collected from this area and horizon. 



*Bonneterrina appalachia 

 *Coenaspis spectabilis 

 *Coosella andreas 



Genevievella, sp. undet. 

 *Hawk{nsia minuta 

 *Holcacephalus praecursor 



Ithycephalus typicalis 



Kormagnostiis simplex 

 *Menomonia tuberculata 



Menomonia, sp. undet. 

 *Modocia crassimarginata 



Modocia dubia 

 *Modocia ? agatho 



N orwoodella, sp. undet. 



Norwoodia, sp. undet. 



Tricrepicephalus, sp. undet. 



The next higher faunule is especially well represented in the red 

 limestone beds at the base of the Nolichucky, of very limited extent 



