The Cretaceous, last period of the Mesozoic, covered from 145 to 66 million years ago.
This hall offers the visitor information on the behaviour of dinosaurs; for example, we know about some aspects of their reproduction (laying eggs in nests) or of their social behaviour.
The issue regarding the extinction of the majority of dinosaurs is also considered here as the consequence of a host of occurrences taking place towards the end of the Cretaceous: the impact of a meteorite, volcanic eruptions and intense geographic and climatic changes. One of the exposition areas is expressly dedicated to the shift from non-avian dinosaurs to birds. For years it has been considered the latter were a specialised group of theropods, a hypothesis based on the evolutional similarities presented by the Archaeopteryx (a primitive bird) and certain dinosaurs like the Deinonychus or the Dromaeosaurus.
As representatives of this period and occupying the central circle of the hall, there is a couple of Tyrannosaurus Rex, one of the greatest terrestrial predators in the history of our planet. On one of the lateral ramps of the hall is a reproduction of the exceptional deposit of Las Hoyas in Cuenca, with the outstanding conservation of many fossils, among which those of certain primitive birds and the bone remains of some theropod dinosaurs, such as the Pelecanimimus, should be highlighted.