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Big Bend National Park
The park road passes through this tunnel near the Rio Grande Overlook in eastern Big Bend National Park. The tunnel cuts through massive limestone beds of the Santa Elena Formation of Cretaceous age (deposited around 100 million years ago).
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U.S. Department of the Interior - U.S. Geological Survey - Geology Discipline
The URL of this page is: http://3dparks.wr.usgs.gov/bigbend/html/bb203.htm
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Last modified: 4/1/2005

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