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