Dating video dinosaur brains
For the first time, scientists have described fossilized dinosaur brain tissue which most likely belonged to a Iguanodon-like species that plunged its noggin into a swamp around 133 million years ago, "pickling" the sample in the process.
Tissue samples will degrade over time as bacteria breaks them down, and exposure to oxygen has a big part to play in this.
An answer could lie in the timing of their evolution.
In southern Africa, we know of their existence from their rare body fossils but also, importantly, from their fossil footprints.It’s most likely that both factors lead to theropods in southern Africa being able to evolve into numerous forms and increase in abundance.