44 NOTE IN EXPLANATION OF THE MAP AND SECTION. 
general view of the relations of the strata, until further and more extensive explorations fur- 
nish the material for a better representation. The Carboniferous limestone is represented as 
dipping eastwardly from the Hueco mountains; but as there are no observations respecting an 
outcrop further east until the Guadalupe range is reached, I have not brought it to the surface 
in the section, but terminated it at the base of the granite outcrop of the Alamos. 
As there is no mention of the occurrence of Carboniferous strata on the east slope of the Organ 
mountains, nor on the west of the Hueco range, I have not represented them on the section 
between those ranges. 
Since the section was finished, I have learned from Dr. Antisell that the Carboniferous lime- 
stone of the Organ mountains is overlaid by a sandstone, which is probably of the same age. 
I did not venture to bring it to the surface in the section, although confident it was present 
below. 
It was deemed so desirable to have the whole section on one sheet, of a width not greater 
than the quarto page, that the spaces between each line were contracted as much as possible. 
It is hoped that the explanation will be a sufficient excuse for the crowded appearance of the 
sheet, 
