384 



C. W. TOMLINSON 



between the top of the fossiliferous Bighorn and the base of the 

 typical Madison, which corresponds closely in lithological character 

 with Member 19 as developed farther northwest. In the Bighorn 



Range, where this belt is 238 feet thick, it was considered by Darton 1 

 to be the basal member of the Madison limestone; but it is unlike 



1 N. H. Darton, "Description of the Bald Mountain and Dayton Quadrangles," 

 Geol. Atlas U.S., Folio 141 (1906), p. 4; Goose Creek section. 



