CHARACTER OF THE OLDER TECTONICS 



557 



least 4,000 feet. The general geologic section across the northern end of 

 this province, about at Engle, may be indicated as in the following dia- 



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Figure 10. — Geologic Cross-section of the Sandia Range 



gram (figure 11). The distance is about 60 miles and the height of the 

 summits 8,000 to 10,000 feet above tide-level. 



Figure 11. — Structure of the north End of Mexican Tableland 



The ancient tectonics of some of the ranges of this province are best 

 indicated in diagram. N'ear Palomas Gap, in the Sierra de los Caballos, 

 a thrust-plane is finely displayed. A cross-section of the range near the 

 point mentioned is represented as follows (figure 12) : 



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 /oo' 



Figure 12. — Old and Young Tectonics of Cahallos Range 



