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13,600-year-old mastodon skull unearthed in Iowa. Researchers have discovered a well-preserved mastodon skull, estimated to be 13,600 years old, in an Iowa creek, the first find of its kind in the state.

Researchers have discovered a well-preserved mastodon skull, estimated to be 13,600 years old, in an Iowa creek, the first find of its kind in the state.

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