Being entirely naive to squid prehistory, the wikipedia page for squid shows two apparent-to-me squid fossils [0]. Is there some nuance here that I'm not aware of?
Tons of fossils are "negative prints on sediments". GP's assertion that "If humans didn't exist while they do, we would have never known about them" is clearly wrong.
[0] https://en.wikipedia.org/wiki/Squid#Evolution