What did not happen in during the Cenozoic era?

During the Cenozoic era, which began about 66 million years ago, the dinosaurs did not exist, as they became extinct at the end of the Mesozoic era. Additionally, the formation of major geological features, such as the Himalayas and the Rocky Mountains, was largely completed prior to the Cenozoic. Furthermore, significant events like the formation of the supercontinent Pangaea occurred long before this era, as it began breaking apart during the Mesozoic.