Forum:Demise & geartown & sandmoth

if i have an active/set "Geartown" and a face down "Sandmoth", when my "Demise King of Armegeddon"'s effect resolves to bust the field, provided that the busting of these two cards (along with any others destroyed) is the last thing to happen, may i activate both effects of "Sandmoth" and "Geartown"? i belieive its a SEGOC situation and they could start a chain but i must be certain.

À Nazias Kram Ā