22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



Collection cnb/10 : 



Ankoura triangularis c 



Kormagnostus simplex r 



Olenoides, sp. undet. r 



River Ridge. — A section of the uppermost part of the Nolichucky 

 formation (Maynardville limestone member) was measured in a deep 

 cut on the W. side of U.S. Route 25-E where it crosses River Ridge, 

 a short distance N. of the bridge on the Clinch River (Howard Quar- 

 ter quadrangle). At the top of the measured section are readily recog- 

 nizable, massive beds of dolomite that may be considered the base of 

 the Copper Ridge dolomite. 



Thickness 

 Feet 



14. Dolomite : mottled, weathering to rough surface. This bed is almost 

 at top of exposures on west side of road ; higher beds exposed on 



east side 3 



13. Dolomite : thick-bedded, weathering to smooth surface. This and the 



overlying unit may be referred to the Copper Ridge dolomite 6 



12. Shale 2 



11. Dolomite, one bed 2 



10. Shale: dark gray, hard, not fissile, with some interbedded dolomite 



but very little limestone 7Z 



9. Shale : dark gray, fissile 5 



8. Shale : as unit 10, but containing thin limestone beds and lenses 18 



Collection cnv/21, 10 feet above base : 

 Aphelaspis tarda c 



Collection cnu/21, 4 feet above base : 

 Aphelaspis tarda c 



7. Shale : dark gray, fissile, with one limestone bed in middle of interval .... 3 

 6. Shale, alternating with thin-bedded limestone; more shaly in upper 



5 feet 22 



Collection cnu'/21, in limestone bed at top : 

 Aphelaspis tarda 



5. Shale : finely fissile 3 



4. Limestone, ribboned with shale or dolomite 5 



3. Shale, finely fissile. Thickness approximate 20 



2. Limestone, ribboned with shale or dolomite 3j4 



1. Shale: finely fissile, only the uppermost portion exposed. Thin lime- 

 stone lenses present 20-25 feet below top not measured 



Collection cnt/21 in limestone lenses : 

 Aphelaspis arsoides c 



Aphelaspis tumijrons c 



Pseudagnostus communis c 



KNOX COUNTY 



Copper Ridge. — Numerous Upper Cambrian fossils in the U.S. 

 National Museum collections were recovered from beds of the Ce- 

 daria, Crepicephalus, and Aphelaspis zones on the NW. slope of Cop- 

 per Ridge near Bull Run, south of Heiskell (Powell quadrangle). 



