Black plaque № 15984

Marathon, TX, United States

Los Caballos (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 s

ides 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 (s

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