New Mexico Museum of Natural History and Science

 

Tusas-Brazos Volcanos


Location: 36° 30' to 36? 45'N, 106° 18' to 106° 38' W, Rio Arriba County
Type: Four scoria cones and associated basaltic lava flows.
Age: Late Pleistocene
Significance:

Unusual location on summit of Tusas Moun- tains; flows from the twin Brazos cones flowed several thousand feet down in elevation along the Brazos Box to the lower elevations at Tierra Amarilla.


Composition:

 Basalt

 

 

 

Brazos Cliff with Brazos Cones on far right

 


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