NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 19 



Thickness 

 Feet Inches 



8. Shale 5 



7. Limestone : massive, coarsely granular, with siliceous stringers 3 6 



6. Shale, with thin limestone beds 2 6 



Collection cnr'/4 in limestone bed at top : 



Aphelaspidella macropyge 

 Collection cnr/4 in limestone bed at base : 

 Aphelaspis arses r 



Aphelaspis cf. lata r 



* Aphelaspidella macropyge c 



Cheilocephalus, sp. undet. r 



Paraphelaspis vigilans r 



5. Limestone : coarsely granular, one bed 2 



4. Shale 2 



3. Limestone pebble conglomerate : one bed 10 



2. Shale, with limestone lenses and thin beds, especially in 



upper portion 18 



Collection cnq"/4 at top : 



Aphelaspis cf. rotundata 

 Collection cnq'/4, 13 feet above base : 



Aphelaspis cf. laxa 

 Collection cnq/4 in a limestone bed 8 feet above base : 



Aphelaspis walcotti 

 Collection cnn/4 in 1-inch limestone bed, 6 inches 

 above base : 

 Coosia alethes c 

 Crepicephalus, sp. undet. No. 1 r 

 Maryvillia arion c 

 Tricrepicephalns thoosa c 

 1. Limestone: massive, granular, aphanitic, or oolitic, poorly 

 bedded, with tan-weathering siliceous stringers ; incom- 

 pletely exposed 60+ 



Although this section is in the same outcrop belt as the Piedmont 

 Road and Russell Gap sections, it shows several differences. Here the 

 Crepicephalus zone includes all the lower, massive limestone unit and 

 extends a few feet above it. The overlying shale has much more inter- 

 bedded limestone. The earliest Aphelaspis zone faunule with Aphelas- 

 pis walcotti is younger than the earliest faunules observed in the 

 Russell Gap, Three Springs, Washburn, and Hurricane Hollow sec- 

 tions. 



UNION COUNTY 



Hurricane Hollow. — A section of the upper portion of the Noli- 

 chucky is exposed along the Hurricane Hollow embayment of Norris 

 Reservoir ( Maynardville quadrangle) and was measured by Dr. C. R. 

 L. Oder, who showed it to the writer. The strata are exposed both 

 in the road cut and along the shores on both sides of the embayment. 



