I don't understand WHY so many confusion about Kull's timeline. If REH wrote that his Atlantean character lived around 100,000 years B.C., this simply means that KULL LIVED 100,000 YEARS AGO, independent of "The Hyborian Age" (apparently) puts a short time between the Valusia's king and Conan!
Let's see other facts: Vendhya was founded at least 10,000 years before Conan, as Rippke himself said in the conan.com. This puts the Vendhya's foundation in 43,000 B.C (if Conan lived in the time said by Rippke) or 20,000 (if the Cimmerian was from 10,000 B.C - in my opinion, whatever of the two dates to Conan's Era seems reasonable). The Yasmina's kingdom was founded by the kshatriyas after a olive-skinned Lemurian people had settled there. Believing they had lived in pre-Vendhya by 500 years, before the coming of the Kshatriyas - and knowing that the Lemurians were enslaved by the Khari for, at least, 2,000 years -, we'll have here AT LEAST 12,500 years between the Great Cataclism and the Age of Conan.
Based upon the Howard's date given to Kull, and the Rippke's one to Conan, and some dates of "The Hyborian Age", I'd make the following draft:
- c. 100,000 B.C.: Age of Kull. In the few following millenia, Atlanteans learn to forge metals, and some of them become civilized, founding Negari in Kaa-u;
- 95,000 B.C.: Atlantis, Mu and Lemuria sank, leaving just little archipelagoes of them. Lemurians are enslaved by the Khari;
- 94,500 B.C.: Lesser Cataclysm. Dagonia is founded and, a few centuries later, is destroyed by Yuetshis;
- 93,500 B.C.: Atlanteans and Picts become ape-men.
- 93,000 B.C.: First Hyborians migrations toward the South, "extending over centuries and ages" (see "Black Colossus");
In some moment, the Lemurians rise and destroy the Khari. When the Khari reach the Vilayet, Lemurians - after Khitai and Old Kosala's foundation - go westward, toward the lands at north of Ghanara. A little before this, in 53,000 B.C, Atlanteans ape-men became Cimmerians ("He [Conan] was a barbarian of a thousand generations of barbarians" - Beyond the Black River).
- 43,500 B.C.: Olive-skinned Lemurians go to the Jhumda River;
- 43,000 B.C.: Vendhya is founded by Kshatriyas. Elder Stygia becomes a powerful kingdom, under the Giant-Kings' rule. Princess Akivasha becomes a vampire;
- 39,000 B.C.: Dark-skinned Khari eventually reach Elder Stygia and conquer it. A great part of the white-skinned people of there flees toward Tybor River;
- 38,500 B.C.: Foundation of Acheron, done by Giant-King's people;
- 36,000 B.C.: Fall of Acheron, under Hyborian's invasions;
- 33,000 B.C.: Age of Conan;
- 32,500 B.C.: Fall of Aquilonia. Picts conquer Aquilonia, Zingara, Argos, Ophir, Western Koth and Western Shem. Hyrkanians conquer Zamora, Britunia, Hyperborea, Corinthia, Eastern Koth, Border Kingdom and Eastern Shem. Gorm is killed by Hialmar, whose Aesir save Nemedia of Picts and Hyrkanians invaders. Stygia is attacked by Black Kingdoms;
- 32,400 B.C.: Beginning of the Glacial Age.
For the time being, the timeline above is just a draft I intend to develop in the future.
At last, a timeline using stuff from other Howad's writings (like "The Shadow Kingdom" and "Men of the Shadows")!