J. J. Stevenson—Laramie Group of Southern Colorado, 131 
The Coal Beds. 
Several coal beds, which seem to be of very limited extent, 
have been omitted. 
masked by debris of the sandstones. 
The breaking up of the lower beds along the western edge 
of the field is so extreme, that at some localities the section of 
the first two hundred feet above the Halymenites Sandstone 
