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The Lewis and Clark Expedition may have discovered the first Mosasaurus fossil in North America. The first possible recorded discovery of a mosasaur in North America was of a partial skeleton described as "a fish" in 1804 by Meriwether Lewis and William Clark's Corps of Discovery during their 1804–1806 expedition across the western United States.
Michael Everhart discovered a series of five large mosasaur vertebrae with two Cretoxyrhina teeth embedded in it. He found evidence the bone material had been partially dissolved where it had not been exposed to the elements. This implies that these vertebrae had been partially digested before fossilization by the shark that fed upon it. [94]
Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. They belong to the order Squamata , which includes lizards and snakes . During the last 20 million years of the Cretaceous period ( Turonian – Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs , mosasaurids became the ...
The genus was one of the first Mesozoic marine reptiles known to science—the first fossils of Mosasaurus were found as skulls in a chalk quarry near the Dutch city of Maastricht in the late 18th century, and were initially thought to be crocodiles or whales. One skull discovered around 1780 was famously nicknamed the "great animal of Maastricht".
Nearly 1,000 new species were discovered by scientists in 2023, including hundreds of wasps and a legless lizard.
During the Triassic, corals were rare in North America. Nevertheless, some were present on the west coast, although these corals did not congregate into reefs. [49] Ichthyosaurs were one of the most important groups of marine reptiles during the Triassic. Important ichthyosaur fossils of this age were preserved in Nevada. [50]
Basilosaurus (meaning "king lizard") is a genus of large, predatory, prehistoric archaeocete whale from the late Eocene, approximately 41.3 to 33.9 million years ago (mya). ). First described in 1834, it was the first archaeocete and prehistoric whale known to scienc
The Milton Lizard, also known as the Creature of Canip Creek, is a cryptid of the giant lizard variety. According to Coffey, the creature was first spotted in a Milton salvage yard, over in ...