You should remove the Gleba-only restriction. When playing on mods like "Only Nauvis" or "Space is Fake", would be nice to utilize this functionality.

If you are willing to mod the mod, then the details on how to remove that restriction are on my other thread.

https://mods.factorio.com/mod/spoilage-petrification/discussion/696e790816821977b4669d08

Basically, tweak the data.lua file and remove these lines.

petrificationRecipe.surface_conditions = {
{
property = "pressure",
min = 2000,
max = 2000
}

I would personally prefer to not tweak this mod to remove the restriction. If you really want, I could also just put up a separate mod with that restriction removed.