Link: https://en.wikipedia.org/wiki/Mesozoic_marine_revolution

The Mesozoic marine revolution (MMR) refers to the increase in shell-crushing (durophagous) and boring predation in shallow-sea (neritic) and some deep-sea marine organisms throughout the Mesozoic era (251 Mya to 66 Mya), along with bulldozing and sediment remodelling in benthic marine habitats

It coincided with the rise of large secondarily adapted marine reptiles... proliferation of shell-destroying mesopredators... a trend toward benthos infaunalization,[2] and extinction/habitat restriction of sessile organisms incapable of reattachment once dislodged

The MMR is an important evolutionary transition from the Paleozoic fauna to the more modern-looking fauna

It is thought that the break-up of Pangaea and the formation of new oceans throughout the Mesozoic brought together previously isolated marine communities, forcing them to compete and adapt

People who spend their time with thinking thoughts that can neither be proven nor denied... I dunno: on one hand reasearching nature is always fascinating and definitely one of the good ways to spend your life, but on the other hand this field often feels quite close to pure fantasy.

what

what

that.

Ah yes, "because we can't see it, we can't know if it is true or not"