Dinosaurs ruled the land during the Mesozoic Era, but crocodiles and their relatives unquestionably ruled the water. Prehistoric crocodiles are usually relegated to the background as supporting actors or extras in our imagined Mesozoic dramas, but the truth is that… Read More ›

Cedar Mountain Formation
List of My Articles on the Cedar Mountain Formation
The reconstructed skull of Utahraptor, on display in Brigham Young University’s Museum of Paleontology. Photo by Jaren Wilkey of Brigham Young University (January 26, 2018). Creative Commons Attribution-Share Alike 4.0 International license.https://commons.wikimedia.org/wiki/File:BYU_Utahraptor_skull.jpg. The Cedar Mountain Formation is a North American geological formation which… Read More ›
Martharaptor
Martharaptor was a therizinosaur theropod dinosaur which lived in Utah during the early Cretaceous Period approximately 135-132 million years ago. Therizinosaurs are known mostly from the middle and later parts of the Cretaceous Period. Fossils dating to the early Cretaceous… Read More ›
Cedrorestes
Cedrorestes, which means “Cedar Mountain dweller”, was an ornithopod dinosaur which lived in Utah during the early Cretaceous Period. The fossils of this animal were discovered in eastern Utah in 2001. These were fragmentary remains consisting of pieces of ribs,… Read More ›
The Choristoderan of the Cedar Mountain Formation
The Cedar Mountain Formation of eastern Utah contains rock layers dated to the early and middle Cretaceous Period, approximately 144-95 million years ago. Most of the fossils found here belong to medium-sized and large-sized dinosaurs, while fossils belonging to smaller… Read More ›
Mierasaurus
Mierasaurus was a turiasaurian sauropod dinosaur which lived in Utah during the early Cretaceous Period approximately 139 to 136 million years ago. Mierasaurus lived during a time when the environment of prehistoric Utah became substantially wetter and more humid than… Read More ›
Hippodraco
Hippodraco, meaning “horse dragon” in a mixture of ancient Greek and Latin, was an ornithopod dinosaur which lived in western North America during the early Cretaceous Period. The fossils were found by Andrew R. C. Milner in 2004 in east-central… Read More ›
Falcarius
Falcarius was a 12 foot long theropod dinosaur which lived in Utah during the early Cretaceous Period, approximately 139 to 136 million years ago. It was a very primitive therizinosaur – so primitive that it still bears a close resemblance… Read More ›
Polyacrodus
Polyacrodus was a genus of prehistoric shark, composed of several species, with fossils found in North America, South America, Europe, Asia, and Africa. The name Polyacrodus means “tooth with many bumps”, and it was officially named by the German paleontologist… Read More ›
Cretaceous Stegosaurs in North America? Maybe
Stegosaurus stenops. © Jason R. Abdale (August 1, 2020) Stegosaurus is one of the most famous dinosaurs in the world. With its large back plates and spiked tail, it’s commonly seen in every child’s dinosaur book and is one of… Read More ›