At this point Geomoria are fairly useless to explore, as there is basically no loot, unless you need steel doors. But I’m not a fan of putting too much loot in them either, since they are at a depth where you can’t even really find iron. I’d suggest thinking of Geomoria as underground cities and keeping any loot equivalent to what is found in a surface village. If the Geomoria were deeper, say -1000 then I’d go with some mese or mese tools. Even then, I’d offer the corpses in the underworld as a comparison. There you find mese and diamond tools as loot, but that’s -3000. So for Geomoria at -200 the loot shouldn’t be equal to the underworld.
A blocky survival game.