NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 9 



of the formational contact occurs at a distance of about half a mile, 

 and no trace of red beds is present. In conclusion, the red beds prob- 

 ably extend for less than 1 mile along the strike. They were observed 

 at no other locality. 



The lower limestone member of the Nolichucky is sharply defined 

 near this locality and has an approximate thickness of 180 feet. 



One mile E. of Rogersville. — A good section of the lower limestone 

 member of the Nolichucky was measured in a cut on the E. side of the 

 road leading to Bell Cemetery. The limestone is 175 feet thick; how- 

 ever, the lower 50 feet here alternate with shale. Good fossils were 

 collected about 40 feet above the lowest limestone bed (cnk/1). 



Highly fossiliferous beds about 45 feet below the top of the lower 

 limestone member of the Nolichucky occur about 0.2 miles SW. of the 

 preceding locality, on the hill S. of a dirt road (loc. cnm/2). Loose 

 blocks on the hill slope (cnm/3) were partly derived from these beds, 

 partly seemingly from a higher horizon, as some hold a faunule more 

 similar to that found in the uppermost beds of the lower limestone. 



Guntown Road. — The lower limestone member of the Nolichucky 

 is fairly well exposed on the E. side of the Guntown Road, about ^ 

 mile S. of Rogersville. Good collections were made from the top beds 

 of the lower limestone member of the Nolichucky (loc. cnn/2). 



Crockett Creek. — Partial sections of the Nolichucky are exposed 

 on the hills S. of Crockett Creek (Pressmen's Home quadrangle). A 

 good section of the lower limestone member was found near the end 

 of a dirt road branching off from U.S. Route 11-W near Bench Mark 

 SN-113. The limestone is approximately 145 feet thick. Numerous 

 fossils were collected from the top beds (loc. cnn/3). 



Price School Road. — A partial section of the Nolichucky formation 

 is exposed on the east side of Price School Road (x = 99-102 mm., 

 y = 475--485 mm.. Bulls Gap quadrangle). Shale beds a few feet 

 above the top of the Maryville limestone yield Kormagnosttts simplex 

 and Norwoodella saffordi as do the strata at the same level in the Big 

 Creek section. The lower limestone member of the Nolichucky, how- 

 ever, is here reduced to a small fraction of the thickness of 150 feet 

 observed in all the sections near Rogersville. It consists of about 30 

 feet of limestone alternating with shale. This limestone is overlain 

 by a thick succession of shale beds with a few, thin limestone lenses. 

 A lens 90 feet above the top of the limestone yielded Amiaspisf sp. ; 

 one 140 feet above contained Coosina sp. and Crepicephalus sp. ; and 

 one 170 feet above, Aphelaspis sp. and Glaphyraspis sp. Even though 

 the fossils are scarce and fragmentary, it is clear that the Crepi- 

 cephalus-Aphelaspis zone boundary is somewhere between 140 and 

 170 feet above the top of the limestone. This is in contrast with the 



