Kronosaurus Fossil at Harvard Museum

 

On display as of August 2022, at the Harvard Museum of Natural History in Cambridge, Massachusetts, USA is the fossil of a short neck pliosaur called Kronosaurus queenslandicus (Longman, 1924) [MCZ 1285]. The creature swam in the early Cretaceous Period seas (135 million years ago). It was found by an Australian rancher R.W.H. Thomas and shown to a member of the 1931-1932 Harvard Australian Expedition William E. Schevill (1906-1994). They were able to dynamite the limestone nodules out and then ship them back to Harvard. After Godfrey Lowell Cabot (1861-1962) provided the financing to prep the fossil, it was put on display in 1959.

Part of the skull, backbone, and paddles had weathered away but were able to be restored. About 30% of the fossil is plaster restoration and original bones are coated in plaster to protect the fossil. It appears the reconstruction has too many vertebrate so the 12.8 meter (42 ft) display should probably only be about 9-10.9 meters (30-36 ft). Also genus and species of this fossil should now be Electus longmani (Noe and Gomez-Perez, 2022).

Opal Plesiosaur Vertebra Fossil

In August 2020, I visited The Field Museum of Natural History. It is an amazing place for any one interested in natural history. My main interests were the fossil and mineral collections on display. One specimen that really impressed me was in the Grainger Hall of Gems. It was an opal plesiosaur vertebra fossil from Australia. The Grainger Hall of Gems started off as a Tiffany & Company gem collection exhibited at Chicago's 1893 World's Columbian Exposition. After the exposition was over, it was purchased and made part of the new museum when it opened in 1921.

Over hundreds and thousands of years silica-rich groundwater dissolve fossil remains and leave silica gel. Once the gel hardens it forms opal. Also included in the display are opal fossilized clam and snail fossils.

I have documented other Australian opal fossils at the Natural History Museum in London, England:
https://louisvillefossils.blogspot.com/2020/02/opal-gastropod-fossils.html

and Muséum National D'Histoire Naturelle Minéralogie et Géologie in Paris France
https://louisvillefossils.blogspot.com/2016/08/opal-belemnite-fossils.html

Cryptoclidus oxoniensis

Pictures taken at the Muséum national d'Histoire naturelle in Paris, France.  Doing some research on the new movie that is now showing at the Louisville Science Center IMAX called Sea Rex: Journey to a Prehistoric World, I found these marine reptile images I took last year.  The natural history museum building is shown in the film in a re-creation of a historical paleontological event.  I need to see this film again and might have some future comments about some of the historical scenes shown in this movie.

The fossil of the marine reptile shown in these pictures are of the Cryptoclidus oxoniensis found in England.  It is a type of plesiosaur from the Middle Jurassic Period.  See this link on Wikipedia for more information.