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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,356 Views)
Fireplume
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Snok Snok Snerson

Ah, thank you for that. That's precisely what I thought.
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Joe99
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can I have a list of the morrison animals and what time they lived so I can see witch ones coextistd
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BossAggron
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Formerly Dilophoraptor

Joe99
Sep 12 2015, 11:16 PM
can I have a list of the morrison animals and what time they lived so I can see witch ones coextistd
https://en.wikipedia.org/wiki/List_of_Dinosaurs_of_the_Morrison_Formation

https://en.wikipedia.org/wiki/Paleobiota_of_the_Morrison_Formation

these'll probably help.
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Joe99
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BossAggron
Sep 13 2015, 12:38 AM
Joe99
Sep 12 2015, 11:16 PM
can I have a list of the morrison animals and what time they lived so I can see witch ones coextistd
https://en.wikipedia.org/wiki/List_of_Dinosaurs_of_the_Morrison_Formation

https://en.wikipedia.org/wiki/Paleobiota_of_the_Morrison_Formation

these'll probably help.
thanks but the don't really when they lived
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BossAggron
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Formerly Dilophoraptor

Joe99
Sep 13 2015, 04:35 AM
BossAggron
Sep 13 2015, 12:38 AM
Joe99
Sep 12 2015, 11:16 PM
can I have a list of the morrison animals and what time they lived so I can see witch ones coextistd
https://en.wikipedia.org/wiki/List_of_Dinosaurs_of_the_Morrison_Formation

https://en.wikipedia.org/wiki/Paleobiota_of_the_Morrison_Formation

these'll probably help.
thanks but the don't really when they lived
well, I think the Pages on the species themselves might help at that point.
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babehunter1324
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I had heared that as a rule of thumb there was a tendency for a size increase in a lot of genus throught the Morrison strata...

As such Saurophaganax and Epanterias come from more recent strata than Allosaurus fragilis, the Ceratosaurus dentisulcatus holotype is also the most recent Ceratosaurus material we have, Stegosaurus armatus likely came after S. stenops and it seems that both Camarasaurus and Dryosaurus got larger as time progressed.

This might be explained as a result of a trophic arms race, altough it could also be explained by the fact Morrison seemingly became more humid in the latter strata, maybe it was due to adifferent reason altogheter or both combined.

It is also worth menitoning that all material found so far from Torvosaurus tanneri seems to come from the mid strata of Morrison.
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Incinerox
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Āeksiot Zaldrīzoti

That is an interesting point raised.

That said, the holotype C. dentisulcatus is also our most mature Ceratosaurus specimen. Its size could very easily be justified by its maturity. Perhaps even its sex - Males could be larger than females, females could be larger than males. We don't know.

I'd also argue that Torvosaurus's presence in middle Morrison strata is more a result of an incomplete sample size. I think the European species, T. gurneyi is not only substantially larger than its American counterpart, but is also from younger strata.

It's perhaps a result of Morrison gradually getting wetter, supplying more herbivores with more food, which means healthier and larger animals. Which also means larger predators. Which pressures herbivores to get larger quicker. Which can be sustained with the more regularly available food supply.

It's probably also why when the Cretaceous rolled in with a new dry spell, Morrison's fauna got hit HARD.
Edited by Incinerox, Sep 13 2015, 06:24 AM.
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Furka
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Is it fine to assume that some members of the Cedar Mountain Formation could have also been found in the Cloverly Formation ? Talking about contemporary species of course (Acrocanthosaurus fauna to be precise).
Also, I couldn't find anything about possible pterosaurs found there, so is there any species that could have been found in that environment based on close contemporary formations ?
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Incinerox
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Āeksiot Zaldrīzoti

It's sorta possible. Fossils attributed to Acrocanthosaurus, Deinonychus and potentially Sauropelta have been found in the very uppermost layers of Cedar Mountain. Though the species of each are indeterminate. It's likely they've been misassigned or perhaps belong to early species of those genera, and not the species we currently recognize.

The problem you have with mixing the two ecosystems is that Cedar Mountain's fauna are distinctly older than Cloverly, which is more contemporaneous with the Antlers Formation and Twin Mountain Formation. And maybe Arundel Formation. Those three have a lot of shared, almost EXCLUSIVELY shared species with Cloverly. And in these areas, we're talking about 115 - 108 Ma.

Cedar Mountain's not so easy to merge into that mix, given most of its fauna are about 140 - 118 million years old, with our best known representatives (the likes of Utahraptor and Hippodraco and co.) are about 125 million.
Edited by Incinerox, Sep 18 2015, 04:40 AM.
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BossMan, Jake
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Son of God

In abelisaurs did they have actual sharp claws on thier hands or more filled down rounded claws similar to those of some large herbivores like iguanodonts? Also what was the first true abelisaur? Wasn't it Kryptops?
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CyborgIguana
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Most of them actually didn't have hand claws at all IIRC.
Edited by CyborgIguana, Sep 18 2015, 04:27 PM.
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Jules
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Mihi est imperare orbi universo

Abelisaurid arms are a scientific enigma. They've got ridiculously muscled shoulders, their upper arms are normal-sized and their lower arms are ridiculously stumpy xD
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Furka
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As for the most ancient, I think that would be Eoabelisaurus from the middle Jurassic.
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Incinerox
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Āeksiot Zaldrīzoti

CyborgIguana
Sep 18 2015, 04:27 PM
Most of them actually didn't have hand claws at all IIRC.
Some even suggest you couldn't even see their fingers at all.
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Jules
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Mihi est imperare orbi universo

Well, there's the All Yesterdays one:

Posted Image
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