Los Caballos

Los Caballos (HM15EE)

Location: Marathon, TX 79842 Brewster County
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Country: United States of America
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N 30° 4.003', W 103° 16.465'

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(In Core of the Ouachita Structural Belt)

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.
HM NumberHM15EE
Marker Number3124
Year Placed1970
Placed ByState Historical Survey Committee
Marker ConditionNo reports yet
Date Added Thursday, October 16th, 2014 at 5:20am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)13R E 666329 N 3327433
Decimal Degrees30.06671667, -103.27441667
Degrees and Decimal MinutesN 30° 4.003', W 103° 16.465'
Degrees, Minutes and Seconds30° 4' 0.18" N, 103° 16' 27.90" W
Driving DirectionsGoogle Maps
Area Code(s)432
Closest Postal AddressAt or near 9 Roadside Park, Marathon TX 79842, US
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