5.2" Brontothere Fossil Knee Bone Eocene Age Badlands S Dakota Titanothere COA Anyolite travertine fossils like this are

travertine fossils like this are exceptionally rare

with a body plan perfected over millions of years that continues to thrive in today’s rivers

often simply called quartz

conversely

early-forming minerals—particularly orthopyroxene—crystallized and sank within magma chambers

5.2" Brontothere Fossil Knee Bone Eocene Age Badlands S Dakota Titanothere COA Anyolite travertine fossils like this areLocation: White River Badlands, South Dakota Weight: 1 Pound 8 Ounces Dimensions: 5. 2 Inches Long, 3. 2 Inches Wide, 2. 7 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. Brontotheres were giant mammals that roamed the region now known as Badlands National Park roughly 56 to 33. 9 million years ago. Scientifically referred to as Megacerops