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Callovian Fauna of South America ( 164 ma) by WDGHK Callovian Fauna of South America ( 164 ma) by WDGHK

Out of all the dinosaur fossil bearing formations in South America the Cañadon Asfalto Formation is probably the most obscure, yet it provides several intresting fossils that give us an insight about often overlooked Jurassic fauna of South America.

The Callovian-Oxfordian age (166-156 ma) as whole is often overlooked in general, yet it has a suprisingly large amount of dinosaur discoveries and even full fledged ecosystem from that time, most notably in Asia.

The Callovian fauna of Argentina isn't too rich as far as we currently know, with a notable absence of numerous types of dinosaurs like stegosaurs and ornithopods and only one, very fragmentary pterosaur taxon has been found in this formation, yet at least 3 types of large sauropods have been unearthed here, including a cetiosaur and camarasaur, hower it's most intresting finds are a trio of theropods, 2 of which are a pair of closely related megalosaurs, both around 4,5 m long, the long snouted Condorraptor and the more box faced Piatnitzkysaurus. These 2 are the main representetives of the piatnitzkysaurs, a basal subgroup of megalosaurs even more distant from the "true megalosauru" liniage then even the spinosaurs.

The other theropod found here was Eoabelisaurus, who as it's name implies is one of the oldest known abelisaurs and a suprising bit of evidence of how far back this highly sucesfull group of ceratosaurs went, as they are usually assosiated with the Cretaceous. And intrestingly, with a lengh of nearly 6 m it was the largest carnivore in the ecosystem that we know of, dwarfing the local tetanurans,  which makes it an intresting subversion of the usual predator hierarchy of the late Jurassic.     

Another intresting find was Argentoconodon, a volaticother mammal that was a sort of bat-fly squirrel hybrid.

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:iconfloyatoy:
Floyatoy Featured By Owner Feb 15, 2017
There is another largish tetanuran from the same formation waiting to be published. 
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:iconwdghk:
WDGHK Featured By Owner Feb 15, 2017  Hobbyist Traditional Artist
Intresting.
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:iconantonellisofbbender:
AntonellisofbBender Featured By Owner Feb 15, 2017  Student Filmographer
i always love these arts
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:iconmegaspinosaur:
MegaSpinosaur Featured By Owner Feb 15, 2017   Writer
I had a hunch that these dinosaurs would get some attention. Never would have thought that an Abelisaur was already living in South America during the Middle Jurassic, surprisingly as the top predator in it's ecosystem.
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:icontigon1monster:
Tigon1Monster Featured By Owner Feb 15, 2017  New Deviant
The earliest Abelisaur is Ozraptor.
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:iconwdghk:
WDGHK Featured By Owner Edited Feb 15, 2017  Hobbyist Traditional Artist
1.Ozraptor`s classification is dubious since it's only known from a partial tibia 2. I said " one of the oldest'' not "the oldest".  
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:icontigon1monster:
Tigon1Monster Featured By Owner Feb 15, 2017  New Deviant
I think Ozraptor deserves love. Don't you think? Also, it's from the Middle Jurassic.
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:iconwdghk:
WDGHK Featured By Owner Feb 15, 2017  Hobbyist Traditional Artist
Not really, I don't think fossils animals know only from a tibia and with a very dubious classification do much to spark the imagination.   
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:icontigon1monster:
Tigon1Monster Featured By Owner Feb 15, 2017  New Deviant
That didn't stop someone.: a-dinosaur-a-day.com/post/129992928640/ozraptor-subotaii
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:iconflameal15k:
Flameal15k Featured By Owner Feb 15, 2017
Nice!
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:icondinotasia123:
DINOTASIA123 Featured By Owner Feb 15, 2017
Two of these dinosaurs are in Dinosaur King
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February 15
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