A 13,600-year-old mastodon skull is unearthed in an Iowa creek : NPR

Excavators unearth a 13,600-year-old mastodon skull from an Iowa creek.

University of Iowa Office of the State Archaeologist


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University of Iowa Office of the State Archaeologist

Iowa researchers say they’ve excavated the state’s first well-preserved mastodon, a roughly 13,600-year-old specimen that was found in the southern part of the state.

The University of Iowa’s Office of the State Archaeologist said in a Facebook post that the 12-day excavation involving staff and local community members yielded “several mastodon bones,” primarily from the skull.

Radiocarbon dating indicates that this mastodon is roughly 13,600 years old, archaeologists say, and researchers will now scrutinize the bones to look for “any evidence of human activity, such as cut marks.”

“We’re really hoping to find evidence of human interaction with this creature — perhaps the projectile points and knives that were used to kill the animal and do initial butchering,” said John Doershuk, the director and state archaeologist at the Office of the State Archaeologist, in a statement. “There’s also potential evidence on the bones themselves — there could be identifiable cut marks.”

The American mastodon, or Mammut americanum, is a member of the same order as modern-day elephants.

Flags mark the mastodon skull and tusk unearthed during the 12-day excavation.

Flags mark the mastodon skull and tusk unearthed during the 12-day excavation.

University of Iowa Office of the State Archaeologist


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University of Iowa Office of the State Archaeologist

Having stood at nearly 10 feet fall with twisty tusks, mastodons existed from 3.5 million years ago to roughly 10,500 years ago, according to the University of Iowa. Their fossils have been discovered across North and Central America.

Iowa archaeologists said the site of the dig along an eroding creek bank in Wayne County was first brought to their attention in 2022.

A mastodon tusk is seen at the Iowa dig site.

A mastodon tusk is seen at the Iowa dig site.

University of Iowa Office of the State Archaeologist


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University of Iowa Office of the State Archaeologist

The mastodon bones will form part of a new exhibit at the Prairie Trails Museum in Corydon, Iowa, after conservation and analysis is finished at the university.

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