aulacogen

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English

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Noun

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aulacogen (plural aulacogens)

  1. (geology) A tectonic trough on a craton that is formed as the failed arm of a triple-rift junction.
    • 1980, Robert L. Bates, Julia A. Jackson, editors, Glossary of Geology, Falls Church, Virginia: American Geological Institute:
      The Barnett Shale originated as a normal marine shelf deposit on the southwestern fIank of the subsiding Southern Oklahoma aulacogen...

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