18 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



Kingstonia inflata r 



Metearaspis, sp. undet. r 



Terranovella dorsalis r 



Tricrepicephalus thoosa c 



Collection cnw/14 belongs to the uppermost Aphelaspis zone of 

 Tennessee, yielding an assemblage known from a number of sections. 

 The middle portion of the faunizone may be represented in the poorly 

 exposed shale unit. The underlying, massive limestone ofifers a re- 

 markable transition from the Crepicephalus to the Aphelaspis zone 

 within a few feet of beds. Collection cnn/14 contains a typical upper 

 Crepicephalus zone assemblage. Collection cno/14, only 3 feet higher, 

 still includes the typical Crepicephalus zone genera Coosella and Tri- 

 crepicephalus, associated with Aphelaspis and Cheilocephalus. The 

 specimens of Tricrepicephalus are too fragmentary to be specifically 

 identifiable, but the generic characters of the pygidium are unmistak- 

 able. An equivalent faunule was collected from the Three Springs 

 section, where, however, Tricrepicephalus was not found. 



Lost Creek. — A partial section of the upper Nolichucky was studied 

 in a recent road cut near the headwaters of Lost Creek, 0.2 mile W. of 

 Tennessee Route 92, about 2 miles S. of Jefferson City. The lower, 

 massive limestone unit is partly exposed and is overlain by alternating 

 beds of shale, limestone, and limestone conglomerate. The exposed 

 section barely reaches the base of the uppermost limestone unit of the 

 Nolichucky. Notwithstanding the limited exposure, this locality yielded 

 a number of faunules in clear relative stratigraphic order. The section 

 is described below. 



Thickness 

 Feet Inches 



13. Limestone : massive, crystalline, banded with dolomite 2 4 



12. Shale, with small scattered limestone lenses 12 



Collection cnt/4, 0-2 feet above base : 

 Aphelaspis arsoides c 



Aphelaspis tumifrons cc 



Dytremacephalus angulatus rr 



Pseudagnostus communis r 



11. Limestone : crystalline, one bed 1 



10. Shale, with scattered limestone lenses 8 



Collection cns/4, 3-4 feet above base : 

 Aphelaspis inermis c 



Aphelaspis arses c 



Aphelaspis cainiro r 



Aphelaspis laxa r 



Cheilocephalus, sp. undet. r 



Pseudagnostus commtmis r 



9. Limestone: coarsely granular, with insoluble stringers; 



one bed 1 



