At https://archaeologynewsnetwork.blogspot.co.uk/2019/05/the-fossilization-… … a bone bed in Spain from the Lower Cretaceous is offering up fossilised remains of dinosaurs, mammals, crocodiles, pterosaurs, lizards, tortoises, and fish, which all date back 130 million years ago – at roughly the transition from the Jurassic to the Cretaceous (or thereabouts). The bones are fractured owing to the process of subsequent burials (on top of each other) and the assumption is the bones were broken by the weight or pressure of so many other bones, together with sedimentary material. They deduced the bones were subject to rapid burial and soon reached the prhreatic level in which fossilisation processes had already taken place. Microbial activity in the bones was also detected – and this may have encouraged the fossilisation process.
A wealth of young individuals and egg shell remains was also found in the bone bed and the sheer mixture of animals prompted the paleontologists to suggest it was a wetland site or a feeding and breeding area near water. In a catastrophist interpretation the bone bed originated from a tsunami wave (or something similar) washing up marine, freshwater and land animals in one swoop and dumping them alll together in a single deposit. Rapidly. Aka, classic Velikovsky, and burying them in sediment (silt and mud etc).