Myoga and Shippo in “Unfinished Business”

A priestess inside of a stalagmite!? Oh my! Tell me all the juicy details, Shippo!

Shippo

The priestess thrust the sacred Shikon Jewel out of her body while the demon had her in its jaws. And the image of them is set in stone.

Hmm. They recovered in stalagmite, then several centuries must have passed since the battle, just like Sango said.