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Near Marathon in Brewster County, Texas — The American South (West South Central)
 

Los Caballos

(In Core of the Ouachita Structural Belt)

 
 
Los Caballos Marker image. Click for full size.
Photographed by Bill Kirchner, October 24, 2012
1. Los Caballos Marker
Inscription. Highly deformed rocks in the Ouachita Fold Belt, a northeasterly trending range, uplifted about 275 to 290 million years ago. The intricate folding is shown by whitish rock bands—called caballos (the Spanish word for horses)—exposed on both sides of this highway. The Ouachita Fold is comparable in age to the uplift that formed the Appalachians in the eastern part of the United States.

The northwesterly trending Del Norte-Santiago range (southmost extension of the Rocky Mountains) forms the southwestern skyline. The rocks of this range were deposited in a sea that covered the Ouachita Fold Belt after erosion had reduced the highlands and a later submergence lowered the area. Santiago Peak (named for a local man who was killed by Indians and buried beneath the peak) is the high, flat-topped mountain to the southwest. It was once a mass of molten magma that cooled and hardened underneath the earth's surface and was uncovered by later erosion. The Del Norte-Santiago range, uplifted and folded 40 to 60 million years ago, is not half the age of the Ouachita Fold. This is a remarkable fusion of "old" and "young" mountains—and is unmatched at any other site in North America.
 
Erected 1970 by State Historical Survey Committee. (Marker Number 3124.)
 
Topics. This historical
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marker is listed in this topic list: Natural Resources.
 
Location. 30° 4.003′ N, 103° 16.465′ W. Marker is near Marathon, Texas, in Brewster County. It is on U.S. 385 10.3 miles south of U.S. 90, on the right when traveling south. Touch for map. Marker is in this post office area: Marathon TX 79842, United States of America. Touch for directions.

Regionally, this marker is in Texas’ Trans-Pecos & Big Bend Region. It is also in the American Southwest. Globally, it is in North America, a Gulf of Mexico state, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once New Spain, the Comancherνa, the Republic of Texas, and one of the Confederate States of America.

Other nearby markers. At least 6 other markers are within 11 miles of this marker, measured as the crow flies: Fort Peρa Colorado (Red Rock) (approx. 6 miles away); Chambers Hotel (approx. 9.7 miles away); The Gage Hotel (approx. 9.8 miles away); Albion E. Shepard House (approx. 9.9 miles away); Marathon (approx. 10 miles away); Colonel Lewis Given Harman (approx. 10.7 miles away).
 
Another marker is no longer nearby. First School House (was approx. 9.9 miles away but has been confirmed missing).
 
Los Caballos Marker image. Click for full size.
Photographed by Bill Kirchner, October 24, 2012
2. Los Caballos Marker
Los Caballos Marker image. Click for full size.
Photographed by Bill Kirchner, October 24, 2012
3. Los Caballos Marker
 
 
Credits. This page was last revised on June 16, 2016. It was originally submitted on November 7, 2012, by Bill Kirchner of Tucson, Arizona. This page has been viewed 1,323 times since then and 47 times this year. Photos:   1, 2, 3. submitted on November 7, 2012, by Bill Kirchner of Tucson, Arizona. • Bernard Fisher was the editor who published this page.
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Jun. 25, 2026