Frozen Flame Contact
Era: 3000000 B.C.
While contact with the Frozen Flame was not directly mentioned in Chrono Trigger, a passage in Zeal may have alluded to it:
[Book] It all began aeons ago, when man's ancestors picked up a shard of a strange red rock... Its power, which was beyond human comprehension, cultivated dreams... In turn, love and hate were born... Only time will see how it all ends.
In 3000000 B.C., the Early Humans hiding from the Ice Age somehow discovered the Frozen Flame, a splinter of Lavos's shell that allowed contact with the beast. When humans found the Flame, Lavos transmitted evolutionary directives to them that rapidly increased brain size and imbued them with the ability to use magic. It is unclear where the Frozen Flame was at this time or how the early humans came into contact with it; regardless, it evolved early humans into modern humans and marked the coming end of 62 million years of survival spent in the harsh Ice Age. With magic and newfound intellectual powers, the subduing of nature would occur and the Kingdom of Zeal would rise.