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as suggested by its teeth and jaw structure
During the Paleocene epoch (66–56 million years ago)
brontotheres became larger as they evolved and diversified
These formidable marine reptiles excelled as swimmers
4.8" Brontothere Fossil Knee Bone Eocene Age Badlands S Dakota Titanothere COA Prognathodon as suggested by its teethLocation: White River Badlands, South Dakota Weight: 1 Pound 8. 6 Ounces Dimensions: 4. 8 Inches Long, 3. 3 Inches Wide, 2. 4 Inches Thick (Matrix) Eocene Age, 56 to 33. 9 million years Old. Comes with a Certificate of Authenticity. The item pictured is the one you will receive. Brontothere The Thunder Beast of Badlands National Park Brontotheres were giant mammals that roamed what is now Badlands National Park between 56 and 33. 9 million years ago.