LOCALITIES. 207 



56o. (For stratigraphic position and association, see p. 147.) Middle Cambrian; Limestone in upper third of 

 Conasauga limestone, South Bessemer, Jeiiferson County, Ala. (T. E. Williard, 1906). 

 Acrotreta (same one as in 56u). 



56c[. (For stratigraphic position and association, see p. 147.) Middle Cambrian: Limestone at the very top of the 

 Conasauga limestone in quarry at Ketona, about 5 miles (8 km.) northeast of Birmingham, Jefferson County, 

 -Ala. (T. E. Williard, 1906). 

 Lingulella quadrilateralis. 

 Ptychoparia sp. 



66u. (For stratigraphic position and association, see p. 147.) Middle Cambrian: Limestone in upper third of 

 Conasauga limestone 700 feet (213.4 m.) southeast of Valley Creek bridge, near Nineteenth Street Road, 

 Bessemer, Jefferson County, Ala. (T. E. Williard, 1906). 

 Acrotreta (same one as in 56o). 



57. (For stratigraphic position and association, see p. 140.) Middle Cambrian: Shaly lime.'^tone of the Il^ldorado 

 limestone [Walcott, 1908f, p. 184], at the 700-foot (213.4 m.) level of the Richmond mine, Ruby Hill [Hague, 

 1892, p. 43 and PI. I, opposite p. 116], Eureka district, Eureka County, Nev. (C. D. Walcott, 1880). 



Lingulella desiderata. 

 Lingulella punctata. 

 Acrotreta definita. 



Agnostus bidens Meek. 

 Agnostus richmondensis Walcott. 

 Agnostus seclusus Walcott. 



57b. (For stratigraphic position and association, see p. 140.) Middle Cambrian: Limestones at the north end of 

 Mineral Hill, just south of Ruby Hill [Hague, 1892, p. 43, and PI. I, opposite p. 116], Eureka district, 

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

 Lingulella desiderata. 



57c (=57k). (For stratigraphic position and association, see p. 127.) Middle Cambrian: About 2,500 feet (762 m.) 

 above the Lower Cambrian and 2,475 feet (754 m.) below the Upper Cambrian, in the limestone forming 1 

 of the Stephen formation [Walcott, 1908f, p. 209], on Mount Bosworth, north of the Canadian Pacific Rail- 

 way between Hector and Stephen, on the Continental Divide between British Columbia and Alberta, 

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



Micromitra zenobia. 

 Obolus mcconnelli. 

 Nisusia alberta var. 

 Hyolithes carinatus Matthew. 



Ptychoparia,3 sp. 

 Menocephalus?. 

 Neolenus sp. 

 Bathyuriscus?. 



57d. (For stratigraphic position and association, see p. 125.) Upper Cambrian: About 3,215 feet (980 m.) above 



the Middle Cambrian and 375 feet (114.3 m.) below the top of the Upper Cambrian," in green shales near the 



summit of 2b of the Sherbrooke limestone [Walcott, 1908f, p. 204], on ridge west of Mount Bosworth, on the 



Continental Divide between Alberta and British Columbia, Canada (C. D. Walcott and L. D. Burling, 1907). 



Lingulella isse. 



57e. (For stratigraphic position and association, see p. 129.) Lower Cambrian: About 115 feet (35 m.) below the 

 Middle Cambrian, in limestone correlated with the top of Ic of the Mount Whyte formation on Mount 

 Bosworth [Walcott, 1908f, p. 213], 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). 



Acrothele colleni. 

 Acrotreta sagittalis taconica. 

 Scenella varians Walcott. 

 Stenotheca elongata Walcott. 



Albertella sp. 



Olenellue canadensis Walcott. 



Bathyuriscus sp. 



57f. (For stratigraphic position and association, see p. 127.) Middle Cambrian: About 2,200 feet (670.5 m.) above 

 the Lower Cambrian and 2,800 feet (853.4 m.) below the Upper Cambrian, in the limestone forming 1 of 

 the Stephen formation [Walcott, 19081, p. 209], about 0.5 mile (0.8 km.) east of the great "fossil bed" on 

 the northwest slope of Mount Stephen, above Field on the Canadian Pacific Railway, British Columbia, 

 Canada (CD. Walcott and L. D. Burling, 1907). 



Obolus mcconnelli. Orthotheca sp. 



Acrotreta depressa. Scenella varians Walcott. 



Nisusia (Jamesella) cf. nautes. Ptychoparia sp. 



Hyolithes carinatus Matthew. 



a See the lootnote on page 125. 



