a Caldera IS a volcano, specifically the magma pool inside it and the volcanic crater it forms, yellowstone national park is considered a Caldera, it's just that it's so big you need to go in a plane to see most of it to even notice.
Hello My IG name is Doxquemintz I decided to visit your server, just wanted to say, also i wish to apply for mod someday. but if i don't get the position i would still like to help out, even if i don't have power.