Geologic Timescale highlighting the Cretaceous Period 145-66mya
Ceratopsians were restricted to the Late Cretaceous Period with the exception of the Early CretaceousPsittacosaurus (Lucas, 1994).
Macrofloral evidence is not easily collected from the beds that produce dinosaur fossils. However, some Cretaceous terrestrial ecology is known. Considering that Ceratopsians were herbivores, the following is a brief outline of the terrestrial flora that was available for Ceratopsian consumption.