Posted July 29, 2026
When I saw on the U.S. Customs and Border Protection’s preposterously named “Smart Wall” map that the route of a new and unnecessary patrol road across the park will go up and over Mariscal Mountain, my eyes widened in fear and outrage. Was CBP about to blast the mountain into Mariscal Canyon and the Rio Grande? There are reports it is reconsidering, but there is reason to be suspicious.
I am not a geologist. But I love the views of Big Bend National Park’s geology and I have been able to understand it a little over decades of visiting the park. I’m also familiar with some of the more popular Big Bend guide books, like William MacLeod’s Big Bend Vistas: A Geological Exploration of the Big Bend.
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