338 



CHARLES K. SWARTZ 



The species occurring at 850 feet altitude are rare and poorly pre- 

 served. In position and composition they seem to be referable to the 

 Spirifer pennatus var. posterus fauna which would appear to be very 

 slightly developed here. Spirifer disjunctus occurs at 1,300 feet above 

 the base of the Jennings at Ellerslie, six miles northeast on the strike 

 of the preceding section. 



ANALYSIS OF FAUNAS 



An examination of the preceding lists shows that certain faunas 

 may be discriminated in the Upper Devonian of Maryland, which are 



TABLE I 

 Species Observed in the Spirifer pennatus var. posterus Fauna 



well characterized both by their composition and position, 

 be designated as follows : 



Spirifer disjunctus fauna 



Spirifer mesacostalis fauna 



Spirifer pennatus var. posterus fauna 



Naples fauna 



Genesee fauna 



They may 



