l86 SMJTHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



SILVER PEAK GROUP (continued) : 



id (continued) : ^*** 



Fauna (105 feet from the base) : 

 Salterella. 

 Holmia weeksi, new species. 



Total of 1 1,040 



20. Dark, siliceous, indurated shales, shaly sandstone and quartzitic 



sandstone in alternating layers 35 



Fauna: 



Annelid trails. 

 Crusiana. 



2b. Buff, drab, and bluish gray arenaceous limestone alternating in 



layers and bands 120 



2C. Gray and dirty brown sandstones, with bands of light gray 



quartzitic sandstones 125 



2d. Gray limestone, becoming arenaceous and passing into gray and 



dirty brown sandstone 105 



Fauna : 



Traces of fragments of trilobites on the surface of the 

 sandstone. 



2e. Gray and dirty brown, compact sandstone in layers from 2 

 inches to 2 or 3 feet in thickness. In the lower portion of 

 the strata are layers of massive bedded, gray quartzitic sand- 

 stone. Small concretions i to 2 millimeters in diameter are 



very abundant in many of the upper layers 365 



2/. Hard, brown and gray, shaly sandstones, with an occasional 



irregular, thin layer of bluish gray limestone 155 



2g. Bluish gray arenaceous limestone in thick layers 25 



2h. Greenish-colored arenaceous shale 120 



2t. Alternating bands of arenaceous shale and massive bedded, 



gray, quartzitic sandstones 430 



Fauna: 

 ScoUthus occurs abundantly in many of the quartzitic sand- 

 stones. 



Fauna (50 feet from the top) : 

 Salterella. 

 Olenellus (fragments). 



2/. Gray quartzitic sandstones in layers 8 inches to 3 feet in thick- 

 ness, passing below 35 feet into buff to yellowish shale with 

 greenish buff bands, with some interbedded, gray, quartzitic 

 sandstones 485 



Fauna (in quartzitic layers) : 



ScoUthus like S. linearis Haldeman [see Walcott, 1891, 

 p. 603]. 



Fauna (in lower portion) : 

 Obolella, sp. undt. 

 Holmia rozvci, new species. 



