Season 4 Episodes20
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As the Pteranodon Family continues their journey underground, Don accidentally breaks Buddy's trilobite fossil (the oldest fossil in his collection!) When the search for another trilobite fossil turns up empty, their new friend Natasha Necrolestes takes them to Fossil Alley, where the kids learn that
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"What's at the Center of the Earth? (2): Fossils" is episode 18 of Dinosaur Train season 4. It aired on February 20, 2017.