1.8" Brontothere Fossil Toe Bone Eocene Age Badlands S Dakota Titanothere COA

Location: White River Badlands, South Dakota

Weight: 1.5 Ounces

Dimensions: 1.8 Inches Long, 1.2 Inches Wide, 1.1 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, scientifically classified as Megacerops coloradensis, inhabited the Badlands ecosystem throughout the Eocene epoch (56-33.9 million years ago). The vernacular "thunder beast" derives from the presumed acoustic signature of migrating herds traversing Paleogene landscapes. These perissodactyls exemplify dramatic evolutionary scaling, originating as diminutive canine-sized forms during the early Eocene and subsequently achieving late Eocene proportions of 8 feet in height and 16 feet in length—comparable to extant megafauna. Their most conspicuous morphological adaptation involved paired nasal protuberances exceeding one meter, exhibiting pronounced sexual dimorphism. Though brontotheres superficially parallel modern rhinocerotids, they represent a distinct evolutionary lineage; however, coeval Badlands assemblages preserve authentic rhinoceros progenitors, including Subhyracodon. This fossilized phalanx constitutes direct paleontological evidence of these extinct ungulates and their significance within Cenozoic mammalian diversification and adaptive radiation.