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Midnight Volcano is believed to be a buried extinct volcano in southern Humphreys County, Mississippi. It is named after the nearby town of Midnight, Mississippi. During the time it was active, Midnight Volcano may have been a volcanic island in the Mississippi Embayment.[1]
The volcanic activity in the area is associated with the Monroe Uplift,[2][3] and igneous rocks in the region have been dated from 84 to 73 Ma.[4] A well drilled in Humphreys County found around 600 m (2000 ft) of volcanic rock, starting 1110 m (3641 ft) below the surface at the shallowest.[5] The most recent measured volcanic rock was dated to 66 Ma,[6] while older (and deeper) samples were dated at 81 and 94 Ma.[7]
These most recent deposits roughly coincide with the activity of Jackson Volcano, another buried volcano southeast of Midnight[8]
Volcanic debris from this volcanism was also found in the "Coffee sands", a Cretaceous sand layer to the north.[2]
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