858 W. T. LEE UNCONFORMITY IN THE SO-CALLED LARAMIE 



tion of the Laramie of the Denver basin, but contains a flora that is ap- 

 parently older than Laramie. There are several possibilities of interpre- 

 tation, as will be pointed out in the following pages, but the one consid- 



COLORADO 





Figure 1. — Key Map of Part of Northern New Mexico, including Raton Coal Field. 

 (From map of the General Land Office.) 



ered most probable is that the uplift and erosion represented by the "un- 

 conformity is contemporaneous with the post-Laramie uplift and erosion 

 described by Cross 2 and others from the Denver region. 



Location and Condition of the Eocks described 



The area described is in northern New Mexico east of the Eocky moun- 

 tains and constitutes the southern part of the Eaton mesa region, the 



2 Whitman Cross : Geology of the Denver basin in Colorado. U. S. Geological Survey 

 Monograph no. 27, 1896. 



