Hoseumou

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Argentinosaurus

Hello, Hoseumou;

I added a comment to the Argentinosaurus talk page, but I'll paraphrase here: the sizes are estimates, so it's fine to use a range. The Holtz and Dinodata estimates are more current than the DinoRuss estimates. J. Spencer (talk) 15:55, 18 January 2009 (UTC)

Hi Hoseumou, the only one of those magazines I have access to is Science. Note that this is a secondary source, not primary, so it's only reporting on estimates already published elsewhere. It talks about Greg Paul's (early) estimates of 80-100t for Argentinosaurus. I wonder if any of these estimates that are getting upwards of 80t have compensated for the air sac system...

Here's the relevent few paras: "By comparing the dimensions of the fossils with those of the matching bones in more complete titanosaurian skeletons, Bonaparte and Coria estimate that the creature had a hind limb 4.5 meters long and measured 7 meters from shoulder to hip. Add a tail and neck of the usual (titanosaurian) proportions, and Argentinosaurus would have been some 30 meters long.

There are longer dinosaurs, but perhaps no heavier ones. One sauropod from New Mexico, called Seismosaurus, may have measured 40 meters or more from tip to tail. But it was long and lean - as dinosaurs go. Gillette, its discoverer, estimates that Seismosaurus probably weighed between 40 and 80 tons. Argentinosauruss, shorter but stockier, probably matched Seismosaurus in weight, he says.

But Gregory Paul, a respected dinosaur illustrator in Baltimore who has made systematic estimates of the largest dinosaurs' size and weight thinks the difference in build tips the scales decisively in favor of Argentinosaunts. He puts its weight at between 80 and 100 tons - heavier than two fully loaded semi trucks. Paleontologist Dale Russell of the Canadian Museum of Nature in Ottawa, who has seen the bones, agrees with that estimate. "That is the only dinosaur that I feel secure might have approached 100 metric tons," he says. The only thing that might have outweighed it, say paleontologists, is a beast called Amphicoelieas fragillimus, known only from a single titanic vertebra discovered more than 100 years ago in Colorado (and now lost)." Dinoguy2 (talk) 15:47, 28 March 2009 (UTC)

Hello, Hoseumou;

I don't have access to the Greg Paul papers. However, he is active on the Dinosaur Mailing List, so you could try asking him directly (whether or not he supports his older figures I can't say). His most recent posting is here, which includes his e-mail address. J. Spencer (talk) 23:34, 28 March 2009 (UTC)

Thank you for the compliment! The Dinosaur Mailing List can be used with caution. In this case, Mickey is repeating a figure from a publication, so it should be all right because it's referencing an actual publication. Also, because of how the DML works, someone else would have corrected him if he'd gotten it wrong. J. Spencer (talk) 22:13, 31 March 2009 (UTC)

Cretaceous and Pakistani dinosaurs

Hello, Hoseumou;

I will bring up splitting the Cretaceous dinosaurs at WT:DINO, as that is quite a few for one category. As for dinosaurs of Pakistan, the topic was discussed briefly at Wikipedia talk:WikiProject Dinosaurs#Odds and ends for attention. If I recall correctly, there are both Asian and Gondwanan parts to Pakistan, but the dinosaurs are on the Gondwanan part and would thus fall under the Indian-Madagascar category. The major problem is naming the category. J. Spencer (talk) 16:07, 12 December 2009 (UTC)

Categories

Not a bad idea to divide the time periods into epochs (Upper/Middle/Lower) rather than full periods as they are so long. I'd bring this idea up at Wikiproject:Dinosaurs and see what others think.

As for Pakistan being part of the Indian/Malagasy land mass during the Mesozoic, it's a bit complicated. The less mountainous eastern region is part of the Indian plate, but the western region is part of the Iranian plate. So it depends on where in Pakistan the dinosaurs were found. It looks like they're all from western Pakistan, which was probably not part of the Indian continent. Dinoguy2 (talk) 23:19, 12 December 2009 (UTC)

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