UPPER DEVONIAN FAUNA. 79 



at this locality that the two Mackenzie River species are seen associated 

 together in the same matrix. The following is the list of species collected at 

 Woodpeckers Peak: 



Orthis macfarleni. Productus truncatus. 



Streptorhynchus chemungensis, var. pandora. Spirifera (M.) maia. 



Streptorhynchus chemungeiisis, var. perversa. Atrypa reticulans. 



Ehynchonella castanea. Nyassa parva. 



Strophomena rhomboidalis. Edmondia piuonensis. 



Chonetes deflecta. Paracyclas occidentalis. 



Productus hallanus. Metoptoina devonica. 

 Productus subaculeatus. 



On the south slope of Sentinel Peak, southeast of the last locality, at 

 about the same horizon as the grouping of fossils, a small collection 

 was obtained, all but two of them being identical with those observed at 

 Woodpeckers Peak, and all of them, without exception, forms recognized 

 from the Upper, as well as the Lower, horizon. The two species not known 

 at Woodpeckers Peak are Styliola fissurella and Lingula ligea, var. nevadensis, 

 the former common tliroughout the Nevada limestone, and the latter a 

 Hamilton species of New York state, collected also from Rescue Hill, of 

 the Upper Devonian. 



Another 1,000 feet of limestone reaches the dark blue massive beds in the 

 upper part of No. 1 of the County Peak section. If the somewhat arbitrary 

 line, provisionally drawn between the Upper and Lower Nevada limestones, 

 is correctly placed about 4,000 feet above the base of the Devonian, these 

 beds would lie at the base of the upper series. In all probability they belong 

 to the Upper Nevada limestone, although there is nothing sufficiently dis- 

 tinct in the meager fauna obtained to determine the question definitely. 

 The only species observed which is at all restricted in its range is Spirifera 

 engelmanni, a form common to the highest members of the epoch, but no- 

 where as yet found lower down than these intermediate strata. Somewhat 

 higher beds give much the same grouping of fossils, and in several localities 

 Spirifera engelmanni has been recognized. The highest horizon in this 

 great mass of limestone from which fossils have been obtained is in a well 

 stratified blue bed near the mouth of Packer Basin, where the fauna has a 

 decidedly Upper Devonian aspect. Among the species collected here are 



