3 8o 



C. W. TOMLINSON 



has prepared the accompanying tentative correlation table (Fig. n) 

 of the sections measured by Iddings and Weed, adding three of his 

 own sections for comparison. The "Jefferson" of Hague, Iddings, 

 and Weed is seen to include the Bighorn dolomite as its chief 



Fig. 11. — Tentative correlation table for sections in Yellowstone Park and vicinity 



constituent, and their "Three Forks limestone" consists chiefly of 

 beds which are properly to be correlated with part of the true 

 Jefferson dolomite as originally defined by Peale. The Devonian 

 fossils identified by Girty 1 from Yellowstone Park came from beds 



1 G. R. Girty, "Devonian and Carboniferous Fossils of the Yellowstone National 

 Park," U.S. Geol. Survey, Monographs, XXXII, Part 2 (1899), chap. xii. 



