Caldera chronicles: What did Yellowstone look like before the hot spot?

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's contribution is from Natali Kragh, graduate student in the Department of Earth Sciences at Montana State University.
What is the difference between a million and a billion? To put these two numbers in perspective we cycle through one million seconds about every 11.5 days whereas we only cycle through one billion seconds every 31.7 years.
So, what does this have to do with Yellowstone geology? Although the modern-day landscape of Yellowstone National Park is covered with volcanic rocks sourced from the hotspot underneath, Yellowstone doesn’t just have rocks from volcanic eruptions.

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