﻿95 Outcrops i 7 



Leiorhynchus utahensis n. sp. 



Spirifer disjunctus var. animasensis 



Pterinopecten sp. 



Actinopteria. sp. 



Cyiherella sp. 



A collection of fossils from the Carboniferous limestone (D) 

 was referred to Dr. Girty, who reports it to represent a fauna of 

 early Mississippian age. The following species were identified 

 by Dr. Girty: 



Menophyllum sp. 



Chonetes logani 



Productus laevicosta 



P. aff . scabriculus 



Spirifer centronatus 



S. striatus var. madisonensis 



Cleiothyridina crassicardinalis f 



Proetus peroccidens 



Cypricardinia scitula? 



Below the Jefferson limestones in the white limestone (A of 

 the section) the following fauna was procured: 



Favosites gothlandicus 



F. cf . niagarensis 



Haly sites catenulatus 



Zaphrentis sp. 



Pentamerus oblongus 



This fauna, though containing a small number of species, is 

 represented by a great number of individuals. Pentamerus 

 oblongus is the most abundant species. The presence of this 

 brachiopod, which is one of the most common and widely distri- 

 buted Silurian species in the Eastern States, places the Silurian 

 age of this fauna beyond question. 



One of these species, H. catenulatus, ranges upward into the 

 dark limestones, where it is not uncommon in both Green Can- 

 yon and Logan Canyon. It does not occur in precisely the same 

 strata as the Devonian fossils, so far as observed. The latter are 

 nearly always found in nonmagnesian beds which occur at inter- 



