- June 2018 + OZL + CZL + mZL
Region: Midwest
Location: Harrison, Nebraska
Link: NPS website
Passport Description: During the 1880s, scientists rediscovered what the Lakota Sioux and others already knew about: 20-million-year-old bones, deposited in what many paleontologists believe is one of the best-preserved Miocene mammal sites in the world.
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