A DEVONIAN OUTLIER OF THE OZARK UPLIFT 



451 



ered out of the basal conglomerates of the Pennsylvanian. In one 

 or two instances, however, there are good reasons for believing 

 that there are small areas of Mississippian rocks which are still in 

 place, and which rest unconformably upon the Jefferson City dolo- 

 mite (Beekmantown), as do also most of the Pennsylvanian outliers. 

 A few months ago the junior author discovered a small outlier 

 containing a fauna which is characteristically Middle Devonian 

 in age. This fauna when identified proved to be of sufficient 

 diagnostic value to place the age of the outlier within very narrow 



Fig. I. — Sketch map showing general location of Devonian outlier. The shaded 

 portion represents the area shown in detail in Figure 2. 



limits. Inasmuch as Devonian has never before been reported 

 from this area, the finding of this outHer gives a little more light 

 on the history of the uplift, and the purpose of this paper is to 

 describe this occurrence and its fauna, and to add its bit of evidence 

 to the history of the region. 



LOCATION AND GENERAL DESCRIPTION 



The Devonian outlier Hes about i^ miles northwest of Rolla, in 

 the NE. I NW. i sec. 3, T. 37 N., R. 8 W. (Fig. i). It is on the east 

 side of the road and Hes fifty feet below the crest of the ridge 



