l82 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



SWASEY FORMATION (continued): 



Feet 

 lb. Drab and reddish argillaceous shales, with interbedded, thin 



layers of fossiliferous limestone 63 



ic. Dark, bluish gray limestone in massive layers that break up 



into irregular, shaly layers one-fourth to 2 inches thick 17 



id. Calcareous and argillaceous shales with thin layers of gray 



limestone 102 



Fauna : 



Micromitra {Paterina) labradorica ufahensis (Walcott) 



[190S, p. 306]. 

 Lingulella argtita (Walcott) [1898, p. 396]. 

 Ptychoparia (2 species). 

 le. Bluish gray limestone in layers 4 to 10 inches thick, with 

 numerous concretions from one-eighth to i inch in diameter, 

 in a few layers % 



Fauna: 



Obolus (Wesfonia) ella (Hall and Whitfield) [1877, p. 232]. 

 Ptychoparia (3 species). 



Total of Swasey formation 340 



DOME LIMESTONE: 



The section of the Dome limestone [Walcott, 1908a, p. 11] is exposed in the 

 central portion of Dome Canyon and adjoining cliffs. Feet 



Massive bedded, cliff-forming, gray, siliceous limestone, with 

 small specks of calcite. One hundred feet from the top, and 

 for 50 feet below, occasional layers 15 inches to 2 feet thick, 

 of brownish yellow, arenaceous limestone, occur 355 



HOWELL FORMATION: 



The section of the Howell formation [Walcott, 1908a, p. 11] is exposed on 

 the west face of the House Range at Howell Mountain. Feet 



la. Bluish black limestone in massive layers that break up on 



weathering into irregular, thin layers 50 



Fauna (in shaly bed at top of la) : 

 Micromitra (Iphidella) pannula (White) [1874, p. 6]. 

 Acrotreta cf. ophirensis Walcott [1902, p. 591]. 

 Ptychoparia. 



lb. Gray, siliceous limestone 8 



ic. Bluish black limestone, similar to la 105 



id. Pinkish colored, argillaceous shale with interbedded, thin 



layers of limestone 10 



Fauna: 

 Micromitra {Iphidella) pannula (White) [1874, p. 6]. 

 Obolus (JVestonia) ella (Hall and Whitfield) [1877, p. 232]. 

 Acrotreta cf. ophirensis Walcott [1902, p. 591]. 

 Sccnella. 

 Ilyolithes. 

 Zacauthoidcs. 

 Bath\iirisciis. 



