CAMBRIAN' CORDILLERAiSr FORMATIONS — WALCOTT II 



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Character. — Alternating bands of thin shaly limestone and cal- 

 careous shale. 



Thickness. — 570 feet. 



Organic Remains. — INIiddle Cambrian fauna. 



SwASEY Formation 



Type Locality. — Slopes of Swasey Peak, House Range, Utah. 

 Derivation. — From Swasey Peak, the type locality. 

 Character. — Bluish gray, oolitic, and arenaceous limestone, with 

 some calcareous and argillaceous shales. 

 Thickness. — 238 feet. 

 Organic Remains. — IMiddle Cambrian fauna. 



Dome Formation 



Type Locality. — At the head of Dome Canyon, House Range, 

 Utah. 



Derivation. — From Dome Canyon, the type locality. 



Character. — Massive bedded, gray siliceous limestone. 



Thickness. — 355 feet. 



Organic Remains. — No traces of fossils, but referred to the 

 Middle Cambrian because both overlaid and underlaid by rocks con- 

 taining a Middle Cambrian fauna. 



Howell Formation 



Type Locality. — In slopes of Howell Peak, on the west side of 

 the House Range, about 5 miles w^est of Antelope Springs, House 

 Range, Utah. 



Derivation. — From Howell Peak, the type locality. 



Character. — Dark, more or less massive limestone and pinkish 

 argillaceous shales. 



Thickness. — 640 feet. 



Organic Remains. — Middle Cambrian fauna. 



PiocHE Formation 



Type Locality. — Southeast of the town of Pioche, Nevada, on 

 road to Panaca, L'tah. 



Derivation. — From Pioche, the type locality. 



Character. — Arenaceous and argillaceous shaly layers with some 

 thin layers and bands of limestone more or less irregularly inter- 

 bedded and limited in horizontal distribution. 



Thickness. — At Pioche. Nevada, 210 feet. On the west face 

 of the Highland Range. 18 miles west of Pioche, this formation 



