Other
Black Hills Institute of Geological Research, Inc.: Acrocanthosaurus
The Acrocanthosaurus lived 50 million years before Tyrannosaurus Rex did and was almost as immense. The discovery and excavation of an Acrocanthosaurus skeleton is detailed accompanied by a slide show of scientists preparing the skeleton...
Curated OER
Black Hills Institute of Geological Research, Inc.: Acrocanthosaurus
Acrocanthosaurus skeleton.