PALEOZOIC STRATIGRAPHY OF ROCKY MOUNTAINS 123 



Snowy Mountain, Wyoming.— W. H. Weed, "Geology of the Southern 

 End of the Snowy Range," U.S. Geol. Survey, Monographs, XXXII, Part 2 

 (1899), chap, vi, pp. 206, 213-14. 



With the exception of Black welder's section at Labarge Moun- 

 tain none of these was described in detail, and the correlation given 

 for them is of necessity very general and subject to thoroughgoing 

 revision. 



Additional data on the thickness of Cambrian and Mississippian 

 members were secured from the following sources: 



Teton River, Wyoming. —Eliot Blackwelder, unpublished manuscripts, 

 U.S. Geol. Survey. 



Antler Peak, Wyoming.—]. P. Iddings and W. H. Weed, "Descriptive 

 Geology of the Gallatin Mountains," U.S. Geol. Survey, Monographs, XXXII, 

 Part 2 (1899), chap, i, p. 22. 



Logan, Montana.— A. C. Peale, "Description of the Three Forks (Montana) 

 Sheet," Geol. Atlas U.S., Folio 24 (1896). 



Livingston Peak, Montana. — Arnold Hague, "Description of the Livingston 

 (Montana) Sheet," Geol. Atlas U.S., Folio 1 (1894). 



Crandall Creek, Wyoming. — Arnold Hague, "Description of the Absaroka 

 Quadrangle," Geol. Atlas U.S., Folio 52 (1899). 



Rattlesnake Mountain, Wyoming. — C. A. Fisher, "Geology and Water 

 Resources of the Bighorn Basin, Wyoming," U.S. Geol. Survey, Prof. Paper 

 No. 53 (1906), p. 14. 



Goose Creek Ridge, Wyoming. — N. H. Darton, "Description of the Bald 

 Mountain and Dayton Quadrangles," Geol. Atlas U.S., Folio 141 (1906). 



Princeton, Montana. — W. H. Emmons and F. C. Calkins, "Geology and 

 Ore Deposits of the Philipsburg Quadrangle, Montana," U.S. Geol. Survey, 

 Prof. Paper No. 78 (19 13). 



Data concerning the Three Forks formation near Logan, 

 Montana, were taken from: 



W. P. Haynes, "The Fauna of the Upper Devonian in Montana, Part 2, 

 The Stratigraphy and the Brachiopoda," Annals of the Carnegie Museum, X 

 (1916), 16-17. 



STANDARD LIST OF MEMBERS 



Constituting the Middle Paleozoic Section in Western Wyoming, 

 Southwestern Montana, and Northeastern Utah 

 (M.T. = Maximum thickness known in this region) 

 mississippian 

 3. Main body of the Madison limestone. Interbedded massive and flaggy 

 limestones, blue-gray, gray, brown, or black, crystalline to dense, with some 

 layers abundantly fossiliferous. Chert of local occurrence only. M.T., 



