LOCALITIES. 211 



59ni. (For stratigraphic position and association, see p. 147.) Lower Cambrian: Weisner quartzite in the Roan 

 iron mine, Bartow County, Ga. (S. W. McCallie, 1900). 



Obolella cf. atlantica. 

 Obolella cf. crassa. 

 Archaeocyathus? . 



Stenotheca cf. rugosa (Hall). 

 Olenellus thompsoni (Hall). 



60. (For stratigraphic position and association, see p. 139.) Middle Cambrian: Limestones in upper beds of 

 Secret Canyon shale, across the canyon from the dump of the old Richmond mine shaft. Eureka district 

 [Hague, 1892, Atlas], Eureka County, Nev. (0. D. Walcott, 18801 



Agnostus prolongus Hall and Whitfield. 

 Ptychoparia maculosa (Hall and A\Tiitfield). 

 Ptychoparia unisulcata (Hall and Whitfield). 



Lingulella clarkei. 



Lingulella desiderata. 



Lingulella sp. 



Acrotreta pyxidicula. I 



60b. (For stratigraphic position and association, seep. 130.) Lower Cambrian: About 2,300 feet (702 m.) below 

 the Mount Whyte formation and 200 to 300 feet (61 to 92 m.) above the Lake Louise shale, in the St. Piran sand- 

 stone [T\falcott, 1908a, p. 4], at Vermilion Pass, on the Continental Divide between British Columbia and 

 Alberta, west-southwest of Castle on the Canadian Pacific Railway, Alberta, Canada (C. D. Walcott, 1909). 



* Obolella vermilionensis. 



Wanneria gracile Walcott. 



61. (For stratigraphic position and association, seep. 139.) Upper Cambrian: Limestone in the Dunderberg shale 

 [Walcott, 1908f, p. 184], a little Auth of the Hamburg mine. Eureka district [Hague, 1892, Atlas], Eureka 

 County, Nev. (C. D. Walcott and C. H. H., 1882). 



Micromitra sculptilis. 

 Obolus anceps. 

 Obolus msera. 

 Obolus nundina. 

 Lingulella desiderata. 

 Lingulella manticula. 

 Lingulella punctata. 

 Acrotreta attenuata. 

 Acrotreta idahoensis. 



Acrotreta idahoensis alta. 

 *Acrotreta spinosa. 

 Acrotreta sp. 



Agnostus prolongus Hall and Whitfield. 

 Agnostus tumidosus Hall and Whitfield. 

 Ptychoparia granulosa (Hall and Whitfield). 

 Ptychoparia maculosa (Hall and Whitfield). 

 Ptychoparia unisulcata (Hall and Whitfield). 



62. (For stratigraphic position and association, see p. 139.) Upper Cambrian: Limestone in the Dunderberg shale 

 [Walcott, 1908f, p. 184], in canyon immediately north of Adams Hill, Eureka district [Hague, 1892, Atlas], 

 Eureka County, Nev. (CD. Walcott, 1880). 



Micromitra sculptilis. 

 Obolus discoideus. 

 Lingulella manticula. 

 Lingulella punctata. 



Acrotreta spinosa. 



Agnostus prolongus Hall and Whitfield. 

 Ptychoparia breviceps (Walcott). 

 Arethusina americana Walcott. 



62a. (For stratigraphic position and association, seep. 139.) Upper Cambrian: Limestone on east side of Sierra 

 Canyon, opposite the Jackson mine, Eureka district [Hague, 1892, Atlas], Eureka County, Nev. (C. D, 

 Wa:lcott, 1880). 



Acrotreta spinosa. 



Ptychoparia granulosa (Hall and Whitfield). 



Ptychoparia simulator (Hall and Whitfield). 



63. (For stratigraphic position and association, see p. 139.) Lower Ordovician: At the base of the Pogonip lime- 



stone northeast of Adams Hill, Eureka district [Hague, 1892, Atlas], Eureka County, Nev. (C. D. Walcott, 



1880). 

 *Obolus anceps. I Schizambon?. 



*Elkania ambigua. Syntrophia nundina. 



Acrotreta idahoensis alta. I 



64. (For stratigraphic position and association, seep. 139.) Upper Cambrian: Limestone near the Bullwhacker 



mine, Eureka district [Hague, 1892, Atlas], Eureka County, Nev. (C. D. Walcott, 1880). 

 Obolus discoideus. 

 Obolus (Westonia) iphis. 

 Agnostus prolongus Hall and Whitfield. 



65. (For stratigraphic position and association, see p. 139.) Upper Cambrian: Limestone on the eaat side of Sierra 



Canyon, opposite Pinnacle Peak, Eureka district [Hague, 1892, Atlas], Eureka County, Nev. (Arnold Hague 



and J. P. Iddings, 1880). 

 Acrotreta idahoensis alta. 

 Acrotreta spinosr,. 



