LOCALITIES. 



209 



58. (For Btratigraphic position and association, see p. 

 of Secret Canyon shale, east side of New York 

 Eureka County, Nev. (C. D. Walcott, 1880). 



Micromitra sculptilis. 



Micromitra (Paterina) crenistria?. 



Obolus discoideus. 



Obolus maera. 



Obolus mcconnelli. 



Obolua nundina. 



*Obolus (Acritis) rugatus. 



*Lingulella clarkei. 



Lingulella desiderata. 



*Lingulella punctata. 



*Acrotliele dichotoma. 



*Acrotreta idahoensis alta. 



Acrotreta microscopica. 



139.) Middle Cambrian: Shaly limestones m upper beds 

 and Secret canyons. Eureka district [Hague, 1892, Atlas], 



Protospongia fenestrata Salter. 



Hyolithes primordialis Hall. 



Agnostus bideng Meek. 



Agnostus communis Hall and \ATiitfield. 



Agnostus neon Hall and Whitfield. 



*Agnostus seclusus Walcott. 



Agnostus tumidosus Hall and Whitfield. 



Ptychoparia anytus (Hall and Whitfield). 



Ptychoparia haguei (Hall and Whitfield). 



*Ptychoparia Iseviceps Walcott. 



Ptychoparia? linnarssoni Walcott. 



Ptychoparia unisulcatus (Hall and ^^^litfield).■ 



Ogygia? problematica Walcott. 



58f. (For Btratigraphic position and association, seep. 125.) Upper Cambrian: About 3,100 feet (945 m.) above 

 the Middle Cambrian, in the limestone interbedded in the shales forming 2b of the Sherbrooke limestone 

 [Walcott, 1908f, p. 204], ridge west of Mount Bosworth, on the Continental Divide between Alberta and 

 British Columbia, Canada (C. D. Walcott and L. D. Burling, 1907). 



Obolus sp. 



S8i. 



(For Btratigraphic position and association, seep. 127.) Middle Cambrian: About 1,225 feet (373 m.) above 

 the Lower Cambrian, in the shales of the Stephen formation [Walcott, 1908a, p. 3], northeast slope of Castle 

 Mountain, facing the amphitheater north of the Canadian Pacific Railway, Alberta, Canada (C. D. Walcott 

 and L. D. Burling, 1907). 

 Obolus mcconnelli. 



58j. (For Btratigraphic position and association, seep. 127.) Middle Cambrian: About 1,900 feet (579 m.) above 

 the Lower Cambrian and 3,100 feet (945 m.) below the Upper Cambrian, near the base of the limestone 

 forming 2 of the Stephen formation [Walcott, 1908c, p. 238 (7)], on the east side of Mount Stephen, about 

 3,000 feet (914 m.) above the Canadian Pacific Railway track 3 miles (4.8 km.) east of Field, British 

 Columbia (C. D. Walcott and L. D. Burling, 1907). 



Micromitra (Iphidella) pannula. 

 Obolus mcconnelli. 

 Acrothele subsidua. 

 Acrotreta depressa. 

 Hyolithes sp. 

 Agnostus mentis Matthew. 



Agraulos sp. 

 Ptychoparia sp. 

 Zacanthoides sp. 

 Bathyuriscus sp. 

 Albertella sp. 



58k (same horizon as 58p). (For stratigraphic position and association, see p. 129.) Lower Cambrian: Just below 

 the Middle Cambrian, in limestones forming 1 of the Mount Whyte formation [Walcott, 1908c, p, 240 (9)], 

 just above the tunnel on the north shoulder of Mount Stephen, about 3 miles (4.8 km.) east of Field, British 

 Columbia, Canada (C. D. Walcott and L. D. Burling, 1907). 



Acrotreta sagittalis taconica. 

 Nisusia alberta var. 

 *Nisusia (Jamesella) lowi. 

 Stenotheca elongata Walcott. 

 Scenella varians Walcott. 

 Platyceras sp. 



Hyolithes billingsi Walcott. 

 Ptychoparia sp. 

 Crepicephalus sp. 

 Protypus sp. 

 Albertella sp. 



581. (For stratigraphic position and association, see p. 128.) Middle Cambrian: About 1,830 feet (557.8 m.) above 

 the Lower Cambrian, in the limestone forming 3b of the Stephen formation [Walcott, 1908c, p. 238 (7)], on 

 the east side of Mount Stephen, about 3,000 feet (914.4 m.) above the Canadian Pacific Railway track, 3.5 

 miles (5.6 km.) east of Field, British Columbia (C. D. Walcott and Mr. and Mrs. L. D. Burling, 1907). 



Micromitra zenobia. 

 Lingulella desiderata. 

 * Billingsella marion. 



62667°— VOL 51, pt 1- 



Hyolithes sp. 

 Microdiscus sp. 

 Ptychoparia sp. 



