Ok, a random thought I had a few years ago, that sticks around without being a serious headcanon:
The deep past of Dark Sun is Dragonlance. The Silt Sea? Blood Sea of Istar.
Not gonna lie, this runs into major problems if you think about it too long or look at the map too closely, but it does give you some ideas for further development.
It also means that the halfling progenitors of long ago that the rhul-thaun look up to? They were kender. 