Midgard

First World (~1 million to ~200,000 years ago)
Second World (~200,000 to ~50,000 years ago)
Third World (~50,000 to ~12,000 years ago)
Fourth World (~12,000 years ago to Present)

Ignatius Donnelly

The God Odin, Woden, or Wotan

It is plausible that the Scandinavian Olympus was Atlantis. Odin is depicted as a grave, elderly man with a long beard, carrying a spear, and accompanied by two dogs and two ravens

Ymir and the creation of the world is a central myth in Norse mythology, explaining the origin of the cosmos and its elements.