Marathon orogeny

Marathon orogeny

      mountain-building event in the Marathon region of western Texas, U.S., during the Late Carboniferous Period (from 318 million to 299 million years ago). Rocks of Early Permian age (from 299 million to 271 million years old) that overlie the Pennsylvanian and older strata in this region exhibit great angular unconformities (i.e., nonparallelism of strata) because the Marathon orogeny was an intense event, one associated with much thrust faulting and overriding of the geosynclinal deposits involved.

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