Mosasaurs

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• Mosasaurs are believed to have evolved from aigialosaurs, which were semi-aquatic lizards that lived during the early Cretaceous period, and who are believed to be related to monitor lizards.
  
  
• In 1869, Edward D. Cope suggested that Mosasaurs and snakes share a common marine ancestor. This idea was based on the similarities observed in Mosasaur and snake jaws, the reduced limbs, and the fact that Mosasaurs may have moved in a similar way to snakes. In the 1990s, the discovery of fossils of early snakes with vestigial limbs in marine sediments seemed to provide support for this hypothesis. However, more recently, other early snake fossils have been found, and since these show animals with hind limbs and an apparently burrowing lifestyle, some doubt has been cast on the idea that Mosasaurs and snakes shared a common ancestor.

Fossil Mosasaur, Pachypleurosaurus Gezobitomenzone, Lower Triassic Photographic Print
Dennis, David M.
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Mosasaurs Timeline:

Mosasaurs were marine reptiles that lived between 96 and 65 million years ago

Related Information & Resources

• Mosasaurs Pictures
  
  
• Prehistoric Animals - Prehistoric and Extinct Animals

Mosasaur Pictures and Posters

Mosasaur Fossil (Keichousaurus Hui), Triassic Period, China 24" X 18" Photographic Print Artist: Ken Lucas.	People Excavate the Spine of an Extinct Mosasaur on a Prairie Pasture 18" X 24" Photographic Print Artist: Jack Fletcher.	Fossil Mosasaur, Pachypleurosaurus Gezobitomenzone, Lower Triassic 21.6875" X 17.6875" Framed Art Print Artist: David M. Dennis.
Fossil Mosasaur, Pachypleurosaurus Gezobitomenzone, Lower Triassic 30.625" X 24.625" Framed Art Print Artist: David M. Dennis.	Fossil Mosasaur, Pachypleurosaurus Gezobitomenzone, Lower Triassic 38.875" X 30.875" Framed Art Print Artist: David M. Dennis.	Fossil Mosasaur, Pachypleurosaurus Gezobitomenzone, Lower Triassic 24" X 18" Photographic Print Artist: David M. Dennis.

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Mosasaur Books

Mosasaur, the Return: Book Two of the Mosasaur Series By David D. Holt AuthorHouse Paperback (352 pages) List Price: $17.99* Lowest New Price: $17.27* Lowest Used Price: $22.52* Usually ships in 24 hours* *(As of 16:28 Pacific 13 Mar 2010 More Info) Click Here Product Description: James King is back, in this sequel that pits man against beast-again. Flashback: the year is 1973 and the W.A.R facility has deposited highly toxic and radioactive waste on a secret base in central Florida. From the 1960's thru the 1980's, another top secret genetic research facility near Welaka releases hundreds of test subjects into the wild near the toxic dumping ground. Since 1973, strange wildlife attacks upon humans have taken place; but suddenly stopped in the year 1992 when the first live Mosasaur appeared through a large sink hole and after seven grueling days of death, that first Mosasaur was exterminated but not before leaving something behind-a brood of seven vicious hungry pups! Eight years have passed and no more attacks upon humans have taken place since that horrible week in 1992, and now only three of the Mosasaur brood remains as they forage for food. The food that they've consumed during the past eight years has been contaminated with toxic and radioactive residues, accelerating their growth rate. Then the attacks begin, first with two fishermen, then a party boat full of people and next three escaped prisoners; the number of dead continue to increase as Putnam County is once again locked down with the US Army, National Guard and countless Law Enforcement officers in a desperate search and destroy mission. John Jason Robards, the eccentric millionaire and fossil collector is back with a vengeance as he maneuvers his childhood friend the Governor into a plot to capture the killer Mosasaur, for Robards has secretly built a massive habitat to hold the vicious predator. Mr. Robards entices Dr. King into running the facility and thus giving Dr. King full access to the Mosasaur, but only if they can catch it in time before it's too late.

Paleoenvironmental interpretations of rare earth element signatures in mosasaurs (reptilia) from the upper Cretaceous Pierre Shale, central South Dakota, ... Palaeoclimatology, Palaeoecology] By D. Patrick & D.C. Parris Elsevier Digital List Price: $5.95* Lowest New Price: $5.95* Available for download now* *(As of 16:28 Pacific 13 Mar 2010 More Info) Click Here Product Description: This digital document is a journal article from Palaeogeography, Palaeoclimatology, Palaeoecology, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser. Description: Rare earth elements were analyzed from fossil marine reptile (Mosasauridae) bones collected from five superposed members (Sharon Springs, Gregory, Crow Creek, DeGrey, and Verendrye) of the upper Cretaceous Pierre Shale at localities along the Missouri River in Brule, Buffalo, Hughes, and Hyde counties in central South Dakota. Fossil bones from each member of the Pierre Shale have different rare earth element (REE) signatures that may be distinctive over wide geographic areas. Fossils from the Sharon Springs Member have distinctive REE signatures that may be further subdivided into three superposed groups that correspond with the upper, middle, and lower Sharon Springs Member. REE signatures are distinctive from each stratigraphic unit; therefore, fossils eroded from their stratigraphic context may be assigned to their proper depositional unit based on REE signature comparisons. Differences in REE compositions of bones among members appear to result from differential mixing of oxygenated and anoxic seawaters. If differences in mixing are interpreted as depth differences, the lower Sharon Springs Member was deposited in deep, anoxic water; water depths decrease in the middle and upper Sharon Springs, and the overlying Gregory and Crow Creek Members were deposited in even more shallow water. Finally, according to this interpretation, the overlying DeGrey and Verendrye members were deposited in progressively deeper marine waters, but not as deep as the lower Sharon Springs. These interpretations are generally consistent with those based on faunal diversity and eustatic sea level curves.

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