In 1871, a federal expedition led by Ferdinand Vandeveer Hayden conducted a detailed geological survey of the Yellowstone area leading to the first geological map and convincing Congress to establish Yellowstone as America’s first national park.
In 1871, a federal expedition led by Ferdinand Vandeveer Hayden conducted a detailed geological survey of the Yellowstone area leading to the first geological map and convincing Congress to establish Yellowstone as America’s first national park.
For a decade, all of our articles (including this one) have been powered by reader support. You can help power the next article, the next session, the next ten years of public-service journalism with a gift today.
We'll send a verification code to %EMAIL%.