The Cretaceous is a geological period that began 145 million years ago and ended 66 million years ago. It is the last period in the Mesozoic Era. It comes after the Jurassic Period and before the ...
during the Cretaceous period. "We do know that during this time period, average temperatures globally were about 82 F (28.1 C), and the average tropical temperature was 93.5 F (34.2 C)," Hughes says.