This video says about itself:
11 September 2015
“Pelagosaurus” is an extinct genus of thalattosuchian crocodyliform that lived during the Toarcian stage of the Lower Jurassic, around 183 Ma to 175 Ma, in shallow epicontinental seas that covered much of what is now Western Europe. The systematic taxonomy of “Pelagosaurus” has been fiercely disputed over the years, and was assigned to Thalattosuchia after its systematics within Teleosauridae were disputed. “Pelagosaurus” measured 3 m in length with a weight of 450 kg, and was markedly similar to the modern-day gharial, which has similar adaptions and carnivorous feeding habits.
“Pelagosaurus” was originally described from a specimen from Normandy, but the holotype for “P. typus” was discovered north of the town of Ilminster in Somerset, England. Most “Pelagosaurus” remains have been found in the Ilminster area, but numerous other remains, predominantly skulls and articulated skeletons, have been found around Western Europe in locations such as France and Germany. Specimens from the Somerset region come primarily from the Strawberry Bank quarry north of Ilminster; although the site had yielded other fossil remains before, the site has since been built over. One of the specimens was that of a small juvenile, providing some insight into “Pelagosaurus'” growth pattern.
The evolutionary relationships of “Pelagosaurus” has been confusing as there have been three different interpretations of its placement in Thalattosuchia.
“Pelagosaurus” was initially classified as a teleosaurid, based upon anatomical similarity, by Eudes-Deslongchamps, Westphal and Duffin.
From The Oregonian:
The rare reptile fossil found by an amateur paleontologist crossed an ocean of time and the Earth’s crust to get here
Saturday, March 17, 2007
RICHARD L. HILL
The ferocious predator plied Asian coastal waters before dying and, stuck in the ocean floor, took a slow, 100 million-year ride east to the sandstone hills of Central Oregon southeast of Prineville.
In its day, the creature lunged from the water to snare low-flying reptiles called pterosaurs. But less than two years ago, Andrew Bland, an amateur fossil-hunter from Vancouver, scanned a hillside near the tiny town of Suplee and spied a curious brownish-black rock, which turned out to be a strange and very, very old skull.
Bland, a software engineer by profession, had stumbled upon the oldest, most complete crocodile ever found in Oregon — a potentially historic find pegged at about 150 million to 200 million years of age.
The deadly creature, called a thalattosuchian from the Jurassic Period, was about 6 to 8 feet long and would have weighed a few hundred pounds, says William Orr, director of the Thomas Condon State Museum of Fossils at the University of Oregon, which houses the extinct animal’s fossilized bones.
“We were all surprised and delighted,” said Bland, who, with eight other amateur paleontologists on a private ranch, was searching for fossilized shellfish called ammonites.
“This darker rock had eroded out of the hillside. We just started digging.”
The streamlined, long-snouted reptile was lethal. Its powerful, sharklike tail — along with a lack of the bony armor that characterizes modern crocodiles — enabled it to speed after prey.
The short-legged, web-footed crocodile is believed to have come on land only to lay its eggs.
Orr, a UO professor emeritus of geology, estimates that about 60 percent of the skeletal bones were uncovered, which he said makes it significantly more complete than two crocodile fossils found in the area in 1941 and 1985.
Orr says the Crook County croc likely became deposited “somewhere in China or Australia or Japan” then took a 100 million-year “conveyor belt” journey across the Pacific.
A package of the rocks the crocodile was in became annexed to present-day Central Oregon in what geologists call the Snowshoe Formation of the Izee Terrane.
Geologists refer to the Izee as an “exotic terrane,” which means a group of rocks that migrated via plate tectonics from its place of origin.
See also here.
A massive volcanic eruption 200 million years ago tipped the scales in the battle between dinosaurs and crocodiles for global dominance: here.
For this study, an international team of scientists set out to better understand today’s oxygen-deprived oceans by investigating the Toarcian Oceanic Anoxic Event (T-OAE), an interval of global oceanic deoxygenation characterized by a mass extinction of marine organisms that occurred in the Early Jurassic Period. “We wanted to reconstruct Early Jurassic ocean oxygen levels to better understand the mass extinction and the T-OAE,” said Theodore Them, a postdoctoral researcher at FSU who led the study. “We used to think of ocean temperature and acidification as a one-two punch, but more recently we’ve learned this third variable, oxygen change, is equally important”: here.
Extinct crocodile of Madagascar: here.
Triassic phytosaurs: here.