An extinct volcano lies buried about 2,900 feet beneath Jackson, Mississippi, under the Mississippi Coliseum. Known through the broad uplift called the Jackson Dome, it has been extinct for at least 66 million years, with the intrusion dated to about 70 million years ago during Late Cretaceous igneous activity around the northern Gulf of Mexico Basin. Its structure was recognized over time, beginning with its discovery in 1819 and later geological interpretations that revealed repeated uplift, intrusions, eruptions, erosion, submergence, and renewed sedimentation. The dome also shaped local rock layers, aided natural gas and oil accumulation, and contains carbon dioxide used in Gulf Coast oil production.

Jackson, Mississippi · USA