Geothermal biome above and below Sulfur Caves

Add a new biome that generates over the sulfur caves. Similarly how Azalea Trees grow over Lush Caves, a Volcanic surface biome could generate above sulfur caves. Gysers and hot pools could generate on the surface. Sulfur caves give off the vibe of being a geothermically active biome. Chaining geothermic biomes together simply makes sense A lava cave could generate below sulfur caves, being the the source of the sulfur in theory. The lava caves could come in a few varieties, with narrow channels, larger cave cavities, and lava falls. Lava channels and lava falls could combine to make a lava river.