The Triassic period
Today, despite your hosts suffering from a nasty cold, we talk about the Triassic period. During this time, the first flying reptiles appear, along with several reptiles that returned to the water. We also get the very first dinosaurs, though they were still rather small, and the very first mammals, which were even smaller rodent-sized animals.
Here’s a link to more information about the Triassic.
And here’s a video about a sudden increase of rainfall that happened during this period, though it only lasted a couple million years before things went right back to being rather dry.