What are the oldest myths we can reconstruct?
I've read that there are themes in myths of people groups separated by tens of thousands of years that are too similar to be a coincidence, indicating that the myths were inherited from the ancient ancestral groups of these peoples. However, the information I've read so far has been overly focused on specific groups (e.g. focusing on the connections between Indo-European speaking cultures and Native American cultures without saying anything about Papuan cultures for instance).
Are there global "myth families" that we can identify similarly to language families? Can we say anything about the myths of the first people to populate Eurasia or even earlier? I'm interested in a global overview rather than something that focuses solely on say Indo-Europeans, and naturally literature for further reading would be greatly appreciated.