PALEOZOIC STRATIGRAPHY OF ROCKY MOUNTAINS 131 



Cf. Bathyurus? (Hystricurus?) tuber culatus Walcott. 

 Ceraurus{?) sp. 

 An Isotelus-like pygidium. 

 Member 4, 390 feet above base: 

 Lingula, 2 sp. 



Two species of strophomenoid brachiopods; the same as the first two 

 of the three forms mentioned in the fauna collected near the top of 

 Member 4. 



Orthoceras sp. (small, annulated form). 

 Asaphus(?) sp. 

 Ceraurus(?) sp. 



UPPER CAMBRIAN 



Member 3. 



Billingsella color adoensis{T) (Shumard). Antler Peak. 



Eoorthis cf. remnicha Winchell. Teton River. 



Obolella{ ?) sp. Teton River. 



Agnostus sp. Teton River. 



Ptychoparia(?) sp. Antler Peak, Teton River(?). 



Trilobite fragments. Blacksmith Fork. 

 Member 2: 



Unidentifiable organic (algal ?) structures. Blacksmith Fork. 

 Member 1: 



Spheroidal algae, \ inch to 2 inches in diameter. Blacksmith Fork. 

 « Member o, top (Blacksmith Fork only) : 



Billingsella coloradoensis (Shumard) . 



Lingulella manticida (White). 



Agnostus. 



Ptychoparia. 



DISCONFORMITIES 



In the following statement is listed the evidence pointing toward 

 discontinuity of sedimentation at the several horizons indicated. 



8. Between Members 20 and 21 of the Devonian system 

 (between Devonian and Mississippian ?) : 



o) Member 20B, a limestone, 361 feet thick at Blacksmith Fork, has no 

 lithologically similar representative in any of the other sections, unless it be 

 a 10-foot limestone at Logan, Montana. 



b) Member 21 rests on Member 19 at Crandall Creek and at Dead Indian 

 Creek. 



c) At Labarge Mountain, Teton River, and Livingston Peak, according to 

 the writer's interpretation, the Madison limestone rests directly on Member 19. 



