DEVONIAN 
Devonian at Hyko, Nevada. — Directly east of the upper 
lange at Hyko. there is an exposure of shaly limestone overlaid by 
massive beds of dark arenaceous limestone carrying a Devonian fauna 
The specimens are poorly preserved, but the following species are 
recognized: 
(570) Stromotopora sp. ?, 
Spirifera sp.?. 
Atrypa reticularis, Linn. 
s \ r -i • S iO tus, Walcott, 
tviediomorpha sp. 
Holopea sp.?. 
Buomphaius (P) laxus. Hall. 
(var) 
The ridge of Devonian limestone extends up the east side 
of the Pahranagat Valley for several miles. Owing to the faulty 
and broken condition of the strata no continuous section was meas¬ 
ured, Jut from one examination I made of it in the two days at my 
disposai. I estimated that there was not far from 3000 feet of the 
limestone, most of which wasfa dark, siliceous variety. 
like the dark dirty brown and drab gray arenaceous limestone of the 
It is not improbable that a portion of the lower 
?art may be referred to the siliceous beds of the Upper Silurian, 
hough "here is no positive proof of this, but the fauna at Hyko is 
10 . e naaliy related to that of the Upper rather than the Lower 
It Is 
Eureka District. 
