Official State Fossil of South Dakota
In 1988, South Dakota designated the triceratops fossil that was discovered in Harding County in 1927 as the official state fossil. The triceratops skeleton is on display at the Museum of Geology in Rapid City, South Dakota. All State Dinosaurs & Fossils
The iconic triceratops lived about 68 million years ago during the late Cretaceous period. Triceratops was a vegetarian dinosaur with a bony frill and fearsome horns for defense from predators like Tyrannosaurus rex.