...to create a set of migration paths for most of the world's mythologies, which could possibly, with a lot of work, be traced back to recreate a sort of proto-mythology resembling that which most of the ancient world's mythologies likely descend from...
Sort of like tracing the roots of many western languages back to their proto-Indo-European origins, and then, theoretically, tracing that language and other nearly primitive languages back to a common source. An interesting idea. In fact, I'd quite like to see how migration patterns of the worlds languages and the religious beliefs and mythologies of the ancient world match up.
-Phil.