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Scientists have identified a new, unusually thick belemnite species from Wyoming’s Jurassic period, revealing that this rare group of marine animals survived longer than previously believed. The fossil, found in the Sundance Formation, shows the creature had a barrel-shaped internal skeleton about 60 millimeters wide and may have reached nearly two feet in length. This discovery suggests the belemnite family persisted in a previously unknown refuge in the ancient Sundance Sea, challenging existing assumptions about their extinction timeline.
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