Talk:Cambrian explosion

Seems many authors (over 30?) in a peer-reviewed study published in a reputable science journal (WP:RS)^[1][2] presented the notion that life forms in the Cambrian explosion may have come from outer space - and not otherwise - seems fringe (WP:Fringe), but worth a consideration? - in any case - Stay Safe and Healthy !! - Drbogdan (talk) 12:59, 29 December 2021 (UTC)

No (Cambrian) explosion and no (Ordovician) event: A single long-term radiation in the early Palaeozoic. Sciencia58 (talk) 13:49, 4 January 2024 (UTC)

After the ‘increase of size and diversity of planktonic animals’ section there is a paragraph on coevolution, is that meant to be a separate section?

Would this paragraph sit better elsewhere? Or is it even necessary in the first place? Especially considering the section on evolutionary arms races. Thoughts? Watopia (talk) 13:42, 12 December 2024 (UTC)

The statement that trilobites appear in the fossil record at 530Ma, but were around for quite some time earlier is contradicted by more recent studies such as James D. Holmes & Graham E. Budd (2022) - Reassessing a cryptic history of early trilobite evolution (Nature Communications Biology 5, 1177): "Trilobites are an iconic Paleozoic group of biomineralizing marine euarthropods that appear abruptly in the fossil record (c. 521 million years ago) during the Cambrian ‘explosion’." That trilobites without exoskeletons may have been around earlier is pure speculation and an ad-hoc explanation for the puzzling "instant" (geologically speaking) appearance of trilobites at 521Ma. Reference 82 (Lieberman, BS, 1999) is totally inadequate in this context as it does not focus on the timing of trilobites but rather on the possible influence of geological events and processes. 150.214.192.127 (talk) 11:31, 23 January 2025 (UTC)

I have looked at the two of the sources on the 13 million year number and one for the 25 million year sources (the others had pay walls) and none of them seemed to be referring to the actual duration of the Cambrian explosion but rather periods before or after it. The abstract of the 13 million year source I could not fully access did explicitly say the first stage of the Cambrian period lasted no less than ten million years, which is less than thirteen million years but did seem to be directly addressing the Cambrian explosion. A lot of skimming is happening on my part and I am no scientist, but I wanted to toss this out there just in case. 134.82.182.168 (talk) 22:59, 22 April 2025 (UTC)

Everyone has a different definition basically it happened sometime during the Cambrian. Houcaris (talk) 23:34, 19 October 2025 (UTC)