NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 23 



This area appears to offer now neither the opportunity for measuring 

 good sections, nor plentiful fossils. A partial section of the Noli- 

 chucky is exposed in the cut of the Southern Railway, and some of 

 the material of Norivoodella walcotti illustrated herein was collected 

 at this locality (cnd/12). The fossils occurred in thin limestone beds 

 in shale, and their stratigraphic position could not be referred to 

 readily recognizable lithic units. 



Mascot. — A partial section of the Nolichucky formation is exposed 

 in a road cut on the E. side of the road leading N. from Mascot to U.S. 

 Route 11-W. The lower limestone unit of the Nolichucky and some 

 of the overlying shale with thin-bedded, partly conglomeratic limestone 

 beds are exposed. Fossils of the Crepicephalus zone were collected 

 from limestone beds in shale about 5 feet above the top of the massive 

 limestone (loc. cnn/19). 



MONROE COUNTY 



Owing to flat topography, exposures are generally scarce in the 

 southwestern portion of the area investigated. A partial section of the 

 Nolichucky formation was studied by A. R. Palmer and R. H. Ray- 

 mond in the bluffs on the E. bank of the Little Tennessee River, near 

 the E. end of the bridge on U.S. Route 411, Two trilobite collections 

 were made. Collection U.S.G.S. 2970 is from a single bed at the top 

 of a 38-foot unit of thin-bedded, knobbly limestone ; collection 2969 

 is from weathered siltstone about 45 feet higher. The author was able 

 to find only fossils of the upper Aphelaspis zone in the higher beds. 



The U.S. Geological Survey collections are interesting because they 

 include 3 species not observed elsewhere. The list of species follows. 



Collection 2969 : 



Dytremacephalus angulatus (complete specimens) 

 Collection 2970 : 



Aphelaspidella macropyge 



Aphelaspis arses 

 * Aphelaspis palmeri 



Cheilocephalus, sp. undet. 

 *Dunderbergia longifrons 

 *Dytremacephalus strictus 



Paraphelaspis vigilans 



Collection 2970 may be correlated with collection cnr/4 from the 

 Lost Creek section and collection cns/20 from the Washburn section, 

 having in common with both Aphelaspidella macropyge, Aphelaspis 

 arses, Cheilocephalus sp. undet., and Paraphelaspis vigilans. Thus the 

 stratigraphic position of the three new species, Aphelaspis palmeri, 

 Dimderbergia longifrons, and Dytremacephalus strictus, is at least 

 approximately determined in the middle Aphelaspis zone. 



