Middle Cretaceous

Euhelopus

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Euhelopus was a sauropod dinosaur which lived in eastern China during the early Cretaceous Period approximately 130-112 million years ago. Fossils of this animal were found in the early 20th Century within the rocks of the Meng-Yin Formation within Shandong… Read More ›

Alectrosaurus

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Alectrosaurus was a small tyrannosauroidean theropod dinosaur which lived in Mongolia during the middle of the Cretaceous Period around 95 million years ago. It is known from partial remains belonging to several individuals, but their incompleteness makes it difficult to… Read More ›

Gigantoraptor

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Gigantoraptor was a massive 25-30 foot long oviraptorosaurian theropod dinosaur which lived in eastern Asia (and possibly in North America) during the middle of the Cretaceous Period. The fossils of this enormous bird-like dinosaur, consisting of a partial skeleton, were… Read More ›

Toxolophosaurus

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Introduction Allow me to introduce you to Toxolophosaurus, “the bow-crested lizard”, which lived in Montana during the early to middle Cretaceous Period approximately 135-115 million years ago. Despite its name, Toxolophosaurus wasn’t either a dinosaur or a lizard. Instead it… Read More ›

Calamopleurus

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Calamopleurus was a 3 foot long freshwater fish which lived in Brazil and northern Africa during the early and middle Cretaceous Period approximately 130-95 million years ago. Calamopleurus belonged to a family called Amiidae. Today, the only surviving amiid is… Read More ›

List of My Articles on the Cedar Mountain Formation

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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 ›

Wuerhosaurus

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Wuerhosaurus was a stegosaur dinosaur which lived in China during the early and middle Cretaceous Period. It was one of the last stegosaurs to have existed, as they had largely been replaced elsewhere in the world by the ankylosaurians by… Read More ›

Polyacrodus

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NOTE: This article was originally published on May 4, 2022. On December 30, 2025, it was updated and re-uploaded. Polyacrodus was a genus of prehistoric shark, composed of several species, with fossils found in North America, South America, Europe, Asia, and… Read More ›