Semionotus was a genus of prehistoric fish which lived throughout the world during much of the Mesozoic Era. It was named by the famous Swiss ichthyologist and paleontologist Louis Agassiz in 1843 (type species: Semionotus bergeri). Semionotus first appeared during… Read More ›
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The Cedar Mountain Hypsilophodont Dinosaur
The Cedar Mountain Formation of the western United States, which is dated to the early Cretaceous Period, has produced fossils of numerous dinosaur species. Several of these are still not officially classified, and this post concerns one of them. In… Read More ›
The Sail-Backed Dinosaur from the Cedar Mountain Formation
Greetings. A few days ago, I learned of a remarkable discovery. In east-central Utah within the rock layers of the Cedar Mountain Formation, dated to the early Cretaceous Period about 135 million years ago (the same time and place where… Read More ›
Gracilisuchus
Gracilisuchus, meaning “the slender crocodile”, was a 2-foot-long reptile which lived in South America during the middle of the Triassic Period. Its remains were discovered in northwestern Argentina within the rocks of the Chañares Formation, which are dated to about… Read More ›
Gargoyleosaurus
When people think of “armored dinosaurs”, they generally think of two kinds of creature: the stegosaurs and the ankylosaurs. Both of these groups belong to the dinosaur sub-order Thyreophora, which means “armor-bearing” in ancient Greek. The dinosaur group Ankylosauria or… Read More ›
The Lives of Raptor Dinosaurs: A Series of Mistaken Preconceptions
Introduction If you were to approach most people who possess a familiarity with paleontology, and ask them about what they know about raptor dinosaurs and how they lived their lives, these people would almost certainly tell you the following four… Read More ›
Zephyrosaurus
Zephyrosaurus was a small ornithopod dinosaur which lived in Montana during the middle Cretaceous Period. The first fossils of this animal were discovered by Charles R. Schaff, who worked at Harvard University’s Museum of Comparative Zoology. Schaff was prospecting for… Read More ›
Microvenator
In North America, dinosaur fossils are found in profusion in rocks dated to the late Triassic, late Jurassic, and late Cretaceous Periods. However, much of the rest of the Mesozoic Era’s time scale contains much sparser remains. The middle part… Read More ›
Astrodon
If you were to ask people if they know a good place to find dinosaur bones, many of them would say “Go west, young man!” There is a lot of truth to this. There are vast areas of western North… Read More ›
Altispinax: The Mysterious Meat-Eater of Early Cretaceous England
Introduction There are many dinosaur species which have been identified based upon very scant remains, and this article concerns one of them: a meat-eating dinosaur named Altispinax dunkeri. If you’ve never heard of this animal before, you’re not alone. It’s… Read More ›
DINOSAURS AND BARBARIANS 