





GEOLOGY PL. XvViil. 
eee 


-ration. Intervals of 500 
feet are shown by the dot- 
-ted contours. The altttudes 
of the promment points tn 
English feet are expressed 
NOTE.— The contours np: 
-resent each, 100 feet ele- 
In the regions of perpetual 
snow and through thr field. bods 
\\ \\ of lava the 500 ket contours 
' only ave continura. 


The summit and crater of 
\ Ppocatepetl are hachured 
as tir down as the contour 
of 17000 feet, 




——— 
\ \\R° Gallinas 
iste 
bes | 







F.ong. 00°30 East from Mexico 
SCALE, r30000- 
CONTOUR MAP OF POPOCATEPETL, IXTACCIHUATL AND VICINITY. 
Reduced from map by August Sonntag and Thomas Jekyll, scale ;oao90, published in Smithsonian Contributions to Knowledge, Vol. XI. 
