Talk:Allosaurus
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Our images found in real life
[edit]This Dutch museum appears to feature a pre-2015 version of Steveoc's Allosaurus reconstruction. Lythronaxargestes (talk | contribs) 21:25, 18 July 2021 (UTC)
- Yeah, seems a lot of museums are using Wikipedia images, not too bad we help them save money, haha... FunkMonk (talk) 15:22, 8 April 2022 (UTC)
Adjust temporal range for Allosaurus
[edit]On this page, the temporal range for the genus Allosaurus is currently set to 155–145 Ma.
Allosaurus jimmadseni was officially described in 2020 by Chure & Loewen (https://doi.org/10.7717/peerj.7803) and in their open access paper, the authors referred the new species to the following age:
"Age — Allosaurus jimmadseni was found in the Salt Wash Member of the Morrison Formation and its lateral equivalents. The Tidwell Member near the base of the Morrison (below the Salt Wash Member) produced a date of 154.82 ± 0.58 Ma (RAIN-1325-4+4 of Kowallis et al. (1998)) and a date of 150.18 ± 0.51 Ma (LCM-1 of Kowallis et al. (1998)) was recovered at the base of the overlying Brushy Basin Member. These two dates constrain the Salt Wash Member between them. These single-crystal, laser-fusion 40Ar/39Ar ages on sanidine crystals were recalibrated (Irmis, Nesbitt & Sues, 2013) to 157.32 ± 0.61 Ma (RAIN-1325-4+4 of Kowallis et al. (1998)) and a date of 152.77 ± 0.3 Ma following the Monte Carlo method of Renne et al. (2010). This places it in the Kimmeridgian Age of the Late Jurassic Epoch (Walker et al., 2012)."
So if Allosaurus jimmadseni is aged 157.32 Ma to 152.77 Ma, then the start of the temporal range for the genus Allosaurus on Wikipedia should be adjusted to 157.32 (or 157) Ma.
So, 157–145 Ma.
Thanks for considering. AlexanderDecommere (talk) 08:40, 8 November 2023 (UTC)
- The current range is consistent with the authors describing A. jimmadseni as Kimmeridgian-aged. The Kimmeridgian begins at 154.8 Ma. The 157.32 Ma estimate, note, is a loose upper bound for the age of A. jimmadseni because it does not come from the Salt Wash Member, it comes from underlying strata. Lythronaxargestes (talk | contribs) 15:46, 8 November 2023 (UTC)
The multiple Allosaurus specimens from Portugal
[edit]The article is rather lackluster in information regarding the Allosaurus specimens from Portugal, other than the A. europaeus holotype. The Andrés Allosaurus, thus far classified as Allosaurus cf. fragilis, is much more complete but is barely mentioned. Furthermore, the material mentioned in the text is (to quote, "a quadrate, vertebrae, ribs, gastralia, chevrons, part of the hips, and legs") is not the complete material attributed to the specimen, since the skull is relatively complete, although disarticulated. No mention is made of the putative juvenile Allosaurus from the Guimarota mine either. I might also say that there is research being done on all of these specimens, and that more information is to be published soon-ish.
I was thinking of adding this information on the "Recent work: 1980s–present" section, on a sub section titled "Allosaurus from Portugal", given that the discoveries in Portugal were all done after 1980. This would greatly enrich the article and bring more attention to these important specimens. This would also complement the discussion on the species in the following section, since the taxonomic status of Allosaurus species in Portugal is still not consensual.
I am writing here to see what the other users think of these changes, and if I start to can write them. All in name of courtesy :) Pfonseca1999 (talk) 17:10, 29 December 2024 (UTC)
- Hi, yes, this article became a Featured Article way back in 2007, and has not really been consistently updated since then, just random additions of varying quality over the years. There are talks about reworking it at WP:PALEOAW, but that will probably take a while to get off the ground, so in the meantime feel free to add improvements you see fit. FunkMonk (talk) 17:22, 29 December 2024 (UTC)
- Meanwhile, the re-diagnosis of A. europaeus has been published (https://www.mdpi.com/1424-2818/17/1/29). Further publications on the other specimens are to be expected.
- I will update the article when I have time. Pfonseca1999 (talk) 15:50, 30 December 2024 (UTC)
- Yeah, quite a coincidence, if you weren't informed beforehand. FunkMonk (talk) 16:42, 30 December 2024 (UTC)
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