LOCALITIES. 227 



165. Middle Cambrian: Limestone on the east side of the valley, in railroad cut about 1 mile (1.6 km.) below 

 the main part of Deadwood, Black Hills, South Dakota. 

 Lingulella similis. 

 Acrotreta idahoensis. 

 Linnarssonella girtyi. 



167. Middle Cambrian: Sandstone beneath limestone and resting on pre-Cambrian "slates, schists, and peg- 

 matites" in bluff 9 miles (14.4 km.) west of Custer, Black Hills, South Dakota. 



Lingulella cuneola?. 



Lingulella (Lingulepis) acuminata. 



Dicellomus politus. 



168. Upper Cambrian: Limestones on north side of Tepee Creek, near the road from Sheridan to Dome Lake, 

 Bighorn Mountains, Sheridan County, Wyo. (C. D. Walcott). 



Eoorthis desmopleura. I Eoorthis remnicha. 



*Eoortliis desmopleura nympha. | Syntrophia primordialis. 



170. Middle Cambrian: Sandstone about 10 miles (16.1 km.) south-southeast of Bald Mountain, Bighorn Moun- 

 tains, Wyo. 

 Obolus matinalis. 

 Dicellomus nanus. 



171 (200 feet below 171a). Middle Cambrian: Sandstone in Big Goose Creek Canyon, in the Bighorn Mountains, 

 west of Sheridan, Sheridan Couilty, Wyo. 

 Lingulella (Lingulepis) acuminata (ranging through 200 feet of beds). 



171a (200 feet above 171). Middle Cambrian: Sandstone in Big Goose Creek Canyon, in the Bighorn Mountains,' 

 west of Sheridan, Sheridan County, Wyo. 

 Obolus (Westonia) ella. 

 Lingulella (Lingulepis) acuminata. 



174:0. (For stratigraphic position and association, see p. 138.) Lower Cambrian: Sandstones on small hill in 

 the salt flat 1 mile (1.6 km.) northeast of Silver Peak mill. Silver Peak quadrangle (U. S. G. S.), Esme- 

 ralda County, Nev. (C. D. Walcott and F. B. Weeks, 1896). 



*Mickwitzia occidens. 



Obolus?. 



Obolella sp. 



175. (For stratigraphic position and association, see p. 138.) Lower Cambrian: Shales carrying Olenellvs on. 

 the divide between Clayton and Fish Lake valleys, about 15 miles (24.2 km.) south-southwest of the town 

 of Silver Peak, Silver Peak quadrangle (U. S. G. S.), Esmeralda County, Nev. (C. D. Walcott and F. B. 

 Weeks, 1896). 



Obolus?. I *Acrotreta claytoni. 



Kutorgina perugata?. | Swantonia? sp. 



176. (For stratigraphic position and association, see p. 138.) Lower Cambrian: Shales and interbedded lime- 

 stones between massive limestone containing Archxocyathus, at the south end of Deep Spring Valley, 

 Inyo County, Cal. (C. D. Walcott and F. B. Weeks, 



Obolella vermilionensis. 

 Obolella? sp. 

 Trematobolus excelsis. 



Wanneria gracile Walcott. 

 Olenellus fremonti Walcott. 



176a. (For stratigraphic position and association, seep. 138.) Lower Cambrian: Sandstone on ridge east of the 

 head of Mazouka Canyon, Inyo Range, Inyo County, Cal. (C. D. Walcott, 1897). 

 Trematobolus excelsis. 



178a (slightly higher than 176, but same locality). (For stratigraphic position and association, see p. 138.) (C. D. 

 Walcott and F. B. Weeks, 1S96.) 

 Trematobolus excelsis. I Wanneria gracile Walcott. 



Billingsella highlandensis?. | Olenellus fremonti Walcott. 



184. (For stratigraphic position and association, see p. 138.) Lower Cambrian: Shales at the summit of the 

 Silver Peak Range, 10 miles (16.1 km.) southwest of the town of Silver Peak, Silver Peak quadrangle 

 (TJ. S. G. S.), Esmeralda County, Nev. (C. D. Walcott, 1896). 



Kutorgina perugata. 



Acrotreta claytoni. 



