Don’t sweat it. Until those post I had never considered the possibility of mammoth ivory being a thing. In my head, ivory is very much a modern thing, that comes only from elephants, even though I know better

Here’s the page where the artist mentions the mammoth Ivory: https://web.archive.org/web/20081113092306/http://www.elfic.fr/scrimpages/alchimie/albedo.htm

Here’s a page where you can buy some mammoth ivory: https://arcticantiques.com/