An Ancient Sea Once Split The United States And Canada Down the Middle
< img src=" https://th-thumbnailer.cdn-si-edu.com/fXjfQAXOFMMxPrE47YUIcyHqS48=/fit-in/1600x0/filters:focal (754x503:755 x504)/ https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/79/1b/791bc42a-4527-4646-a6f1-f435460f9649/untitled.jpg" alt="" > Spectacular marine fossils inform the story of the long-gone Western Interior Seaway and the planet’s previous water life Source
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< img src=" https://th-thumbnailer.cdn-si-edu.com/fXjfQAXOFMMxPrE47YUIcyHqS48=/fit-in/1600x0/filters:focal (754x503:755 x504)/ https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer_public/79/1b/791bc42a-4527-4646-a6f1-f435460f9649/untitled.jpg" alt="" > Spectacular marine fossils inform the story of the long-gone Western Interior Seaway and the planet’s previous water life
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