4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



order. Sections were measured, and are described in some detail, 

 whenever they yielded several faunules in unquestionable stratigraphic 

 succession. Descriptions of lithology are generally limited to those 

 indications that may be useful to a geologist in order to identify in the 

 field the units from which the fossils were collected. In several cases, 

 when the topography was not favorable to an accurate measurement 

 of the thickness, the section was described qualitatively, by giving the 

 succession of the various lithic units and an estimate of their thick- 

 nesses. Even in these cases the time order of the fossils collected is 

 certain. Sections where any kind of structural complication might 

 bring doubt about the sequence of the strata were never used. 



The localities are indicated in the text only approximately with 

 respect to towns, roads, etc., since a complete list of the fossil localities 

 defined by coordinates on the U.S. Geological Survey topographic 

 maps follows. 



Faunal lists given in the descriptions of the sections usually assign 

 to each species an indication of relative abundance (cc = very com- 

 mon, c =i common, r = rare, rr = very rare). These indications are 

 missing when the collection was too small to supply significant data. 

 For brevity, author's names are omitted, since all the species listed are 

 discussed elsewhere in this paper. An asterisk preceding the name in- 

 dicates the type locality for the species. 



Fossil collections are all labeled with the letters en (for Cambrian, 

 NoHchucky) followed by a third letter designating the horizon and a 

 number indicating the locality. At least for the later collections, the 

 same number is applied to all the collections from a given section. 

 As far as possible it was attempted to designate by the same letters 

 correlative beds in the different sections ; a few discrepancies are in- 

 evitable since precise correlation was not always apparent at the time 

 when the fossils were labeled. Collections designated by cna to cne 

 belong to the Cedaria zone, cnk to cnn to the Crepicephalus zone, and 

 cno to cnx to the Aphelaspis zone. 



HAWKINS COUNTY 



Big Creek section, near Rogersville. — The most complete and satis- 

 factory section of the entire fossiliferous portion of the Upper Cam- 

 brian was found along Big Creek, just south of U.S. Route 11 -W, a 

 few miles east of Rogersville, Hawkins County (Burem quadrangle). 

 The U.S. National Museum collections contain numerous fossils from 

 unspecified horizons in this section; several species were described 

 by Walcott (1916a, 1916b) and Resser (1938a). 



A section of the upper portion of the Maryville formation and the 

 entire Nolichucky formation were measured chiefly on the hill slopes 

 on the east bank of Big Creek ; the rest of the Maryville formation was 

 added from complete sections exposed a short distance east along the 



