Exposed ridges of the Ouachita orogeny trend northeast near Marathon, Texas.
The Marathon Uplift is a Paleogene-age domal uplift, approximately 78 miles (126 km) in diameter, in southwest Texas. The Marathon Basin was created by erosion of Cretaceous and younger strata from the crest of the uplift.
The ancient faulting that produced the Llano Uplift is believed to be related to that which produced the Marathon Uplift in west Texas. Both may have been formed around the time of the Ouachita orogeny.
- McBride, Earle F. (1998). "Geology of the Marathon Uplift, west Texas" (PDF). Geological Society of America Centennial Field Guide—South-Central Section.
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