Little Bighorn Battlefield's Plesisaur
Do you know what lies underneath your feet?
The Upper Cretaceous Period ranges from (100 million to 65.5 million years ago) and represents the mud and sand that was originally deposited in a seaway that now makes up a part of the bedrock that underlies Little Bighorn Battlefield National Monument.
In 1977, a routine grave excavation in the Custer National Cemetery turned out to be anything but. A backhoe operated by National Park Service maintenance employee, exhumed the fossil remains of a partial marine reptile, the short-neck Plesiosaur (Dolichorhynchops osborni)! A marine reptile that lived from the end of the Triassic Period 220 million years ago to the end of the Cretaceous Period 60 million years ago.