Conan, a Cimmerian, is a decedent of the Atlantian people who had settled in Valusia, where yes at one point KULL (not Krull) was a King. There is no evidence that Conan was a decedent of Kull himself however.
Also, Kull lived during the Thurian Age which again is 10’s of millions of years after Pangea split up (which you know, was back when non-avian dinosaurs still existed). At the time of the great cataclysm which sank Atlantis, Lemuria and Mu you also had the pictish islands raise up out of the sea to form the mountain peaks of a new continent (North America and based on location these would form the Appalachian Mountains). Being that the picts were allied with Valusia also had settlements in that nation and their decedents were the picts of the Hyborian age.
As for the time period of the Cataclysm which separates the Thurian and Hyborian ages here is a good quote. “The boundary between the two ages is marked by the “Great Cataclysm,” which might have taken place as early as ca. 35,000 to 40,000 B.C, or as recently as 18,000 B.C. depending on the sources considered.”
Pangaea on the other hand “assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago”.