Talk:Cretaceous–Paleogene extinction event

Notes to update Cretaceous stage

Prior to the 2021, that's results of end Cretaceous when asteroid hits the Mexico did happen to 66 million years ago, but according to 2021's paper by Bland et al., they gave it to update the Cretaceous stage was 146-67 million years ago (Early Cretaceous from 146-101 Ma; Cenomanian from 101-94 Ma; Coniacian from 90-86 Ma; Campanian from 84-75 Ma, Maastrichtian from 75-67 Ma).

You have to provide a reference, not just change the text so that it no longer reflects the source cited. It would be best to give the source on this talk page so that it can be discussed. It will probably take more than one paper to gain general acceptance of revision of the dating of the International Commission on Stratigraphy. Dudley Miles (talk) 16:02, 13 July 2021 (UTC)

It would also be great if that sentence would be rewritten, right now it's an unintelligible blob that says nothing. What's the "that's results of end Cretaceous when asteroid hits the Mexico did happen to 66 million years ago, but according to 2021's paper by Bland et al."? What should it mean? Artem.G (talk) 15:37, 21 August 2021 (UTC)

This paper is by "Chris Bland the Whale King"? The same barely coherent vandal who, until he was finally banned, kept vandalizing pages with blatant errors and nonsensical original research?--Mr Fink (talk) 18:37, 30 August 2021 (UTC)

Citation 5

Citation 5 is a photography book, and so doesn't really seem relevant to the statements connected to it, 'With the exception of some ectothermic species such as sea turtles and crocodilians, no tetrapods weighing more than 25 kilograms (55 pounds) survived' I suspect theres an error here — Preceding unsigned comment added by 80.4.214.138 (talk) 11:53, 10 November 2021 (UTC)

Please add info on decline in dinosaur biodiversity millions of years before & timeline items

I think at the least a brief mention is warranted. It's featured in 2022 in science like so:

A study indicates a substantial decline in dinosaur biodiversity millions of years before the Cretaceous-Paleogene extinction event.

There may also be more info in the latest section of Timeline of Cretaceous–Paleogene extinction event research not yet included in the article. Please check that too.

References

Prototyperspective (talk) 21:13, 28 November 2022 (UTC)

This issue is discussed in the article, which states that there have been some studies showing a decline in diversity in the late Cretaceous and others no decline. This is one more regional study and does not seem significant enough to warrant mentioning. Dudley Miles (talk) 23:01, 28 November 2022 (UTC)

Massively glitched page--huge amount of content potentially lost

I just finished a large edit in visual editing mode and added dozens of new papers like "Deccan volcanism caused coupled pCO2 and terrestrial temperature rises, and pre-impact extinctions in northern China" and "No post-Cretaceous ecosystem depression in European forests? Rich insect-feeding damage on diverse middle Palaeocene plants, Menat, France". After I submitted my edit, I looked at the Citations section and the papers I added were nowhere to be found. After several hours of work. What the **** happened?! How did this glitch happen??? I remember copying and pasting every link to single reference I added into the citation tool!!! Is there any way to recover my work so I do not have to do it all over again???!!! Anteosaurus magnificus (talk) 01:18, 19 November 2023 (UTC)

I do not know about visual editing mode but my method in standard mode is to click preview first to check and paste and copy the revised article into Word if there looks like there might be a problem. This usually works to provide a backup, but not always. Dudley Miles (talk) 08:54, 19 November 2023 (UTC)

Where is the finger actually?

The picture with the finger is captioned "finger is below the actual Cretaceous–Paleogene boundary", but the same picture in Cretaceous–Paleogene boundary is captioned "Finger is on the actual K–Pg boundary". They can't both be correct. PointlessUsername (talk) 03:05, 15 August 2024 (UTC)

They both have the same caption that they're on the the actual boundary. [1] [2]. Are you confused between these two images: File:LWA with Walt.JPG and File:Cretaceous Paleogene clay at Geulhemmergroeve.jpg? For the record, they're not the same pictures. _ZZ^Z'S 03:11, 15 August 2024 (UTC)

No. the picture on this article has the full caption

"Complex Cretaceous–Paleogene clay layer (gray) in the Geulhemmergroeve tunnels near Geulhem, The Netherlands (finger is below the actual Cretaceous–Paleogene boundary);"

The one on the other article has the caption

"Complex Cretaceous-Paleogene clay layer (gray) in the Geulhemmergroeve tunnels near Geulhem, the Netherlands. Finger is on the actual K–Pg boundary."

They are the same picture and are described the same except for finger position. The one with people in it is irrelevant. PointlessUsername (talk) 07:49, 15 August 2024 (UTC)

I have now found time to go back and check the history of both pages. The image appears to have been added in 2013 to both this page and Cretaceous–Paleogene boundary, with the caption stating the finger is on the actual boundary. In 2017, someone changed the caption here to below. I'm assuming the correct description, then, is that the finger is on the boundary rather than below it, and I will change the wording on this article accordingly. PointlessUsername (talk) 13:33, 17 August 2024 (UTC)

Figure 5 in this publication (in Dutch) from the same locality says that the K/Pg boundary is at the change from light yellow to dark yellow rock, in which case the finger is just below the boundary (by a few mm). Mikenorton (talk) 16:35, 17 August 2024 (UTC)

I went ahead and corrected the location based on the publication. _ZZ^Z'S 16:45, 17 August 2024 (UTC)