768 



INDEX TO THE STRATIGRAPHY OF NORTH AMERICA. 



Section of the Tertiary rocks of the Great Divide Basin coalfield, Wyoming. 



" The fossil evidence from this group is conflicting and the age of the group can not be decided until further 

 paleontologic work is done. 



b Marine Cretaceous (upper Montana) species were obtained about 500 feet above the base of this formation in 

 sec. 1, T. 21 N., B. 89 W., and at the base in sec. 26, T. 26 N., R. 90 W. They may probably be found at various places 

 in the lower portion, and therefore no definite formation line can be drawn on paleontologic evidence. The base of the 

 sandstones has been used in mapping the formation because it is the only line which is marked lithologically. 



Between the Washakie Basin on the west and the Laramie Basin on the east 

 hes the Hanna Basin of Carbon County, Wyo., which comprises the "Lower Lara- 

 mie" and "Upper Laramie" of Veatch.*"* 



Veatch's generahzed section of the Cretaceous and Tertiary strata is quoted 

 on page 676. His "Lower Laramie" is now recognized as Laramie and as of Cre- 

 taceous age. His "Upper Laramie" is regarded by Knowlton as equivalent to the 

 Lance formation ("Ceratops beds"), which Knowlton believes is of Eocene age 

 and equivalent to the lower part of the Fort Union formation, but which Stanton 



