CAMBRIAN CORDILLERAN SECTIONS — WALCOTT l8l 



MARJUM FORMATION (continued): 



Feet 

 le. Dark, bluish gray limestone in thick beds that break up on 

 weathering into thin, irregular laj'ers one-half to 2 inches 



thick 195 



Fauna: 

 Linnarssonella sp. 

 Agnostus. 

 Ptychoparia. 

 Ogygopsis. 



Total thickness of Marjum formation 1,102 



WHEELER FORMATION: 



The Wheeler formation [Walcott, 1908a, p. 10] is exposed at Marjum Pass, 

 b^it the type localitj^ is in Wheeler Amphitheater, southeast of Antelope 

 Springs. The section was measured south from the ridge soutli of the lower 

 springs of Antelope Springs. Feet 

 I. Alternating bands of thin, shaly limestone and calcareous 

 shale, with shale gradually increasing and predominating 

 toward the lower portion. At 405 feet from top a band of 

 blue-gra3', hard limestone, in layers one-eighth to 2 inches 

 thick, occurs. At 473 feet another band, and below an occa- 

 sional thin layer 570 



Pauna: 



Acrothcle subsidna (White) [1874, p. 6]. 

 Agnostus bidens Meek [1873, p. 463]. 

 Asaphiscus zvheeleri Meek [1873, p. 485]. 

 Ptychoparia kingi (Meek) [1870, p. 63]. 

 These species occur in great numbers at 230 feet to 350 feet 

 from the base. Many hundred trilobites, entire and backed 

 by "cone-in-cone," have been picked up on the surface of the 

 clay, resulting from the disintegration of the shales. 

 Obolus mcconnelli pelias Walcott and Acrotrcta attcnuata 

 Meek occur more rarel}'. 

 SWASEY FORMATION: 



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

 the southwest ridge of Swasey Peak. Feet 



la. Oolitic and arenaceous limestone in massive layers near the 

 top. Below, dark bluish gray limestone is occasionally inter- 

 bedded, and gradually it becomes the principal rock; it 

 breaks up on weathering into irregular, shaly layers one-half 

 to 3 inches thick 152 



Fauna (near the top) : 



Platyceras. 



Zacanthoides. 

 Fauna (near the base) : 



Scenella. 



Zacanthoides. 



Ptychoparia. 



Dorypygc. 



2—\V 



