558 DESCEIPTIVE GEOLOGY. 



On the east side of the range, nearly due east from Chimney Station, 

 were collected a number of fossils, chiefly corals, which, although they 

 have not as yet been specifically identified, are closely related to Upper 

 Helderberg forms. 



Among them were the following: 



Zaphrentis, spJ (figured by Professor Meek). 

 Favosites, sp.°^ 

 Cladopora, sp.? 

 Spirifer, sp.? 



Mr. Henry Engelmann, who accompanied the expedition of Col. J. H. 

 Simpson, obtained in Sw^-llow Canon, at the southern end of the Pinon 

 Eange, Devonian fossils, which Prof. F. B. Meek^ has described in a report 

 accompanying that of Colonel Simpson. 

 The list comprises: 



Produdus subaculeatus. 



Spirifer Utahensis. 



Spirifer Engelmanni. 



Spirifer strigosus. 



Atrypa reticularis. 



Professor Meek regards the group as closely allied to forms found in 

 the Hamilton series of New York in a very similar rock. All of these spe- 

 cies have since been found by us in the Devonian limestone of White Pine. 



It is noteworthy, that while localities of Devonian fossils are as yet 

 somewhat rare in the ranges of the Great Basin, and the Lower Coal-Meas- 

 ure forms of the Wahsatch limestone so abundant, here, in the Piiion 

 Range, the palseontological evidences of the Devonian age of the lower 

 members of the series should be so clearly defined, and exposed in so many 

 localities on both slopes of the range along a north and south line of nearly 

 60 miles. 



Volcanic Rocks of the Pinon Range. — Tertiary eruptive rocks are 

 represented by trachytes, rhyolites, and basalts. From Dixie Pass south- 



^Exploratiou across the Great Basin of Utah iu 1859. Col. J. H. Simpson. 

 Washington, 1876. 



