# IrisBiomePaletteLayer > A layer of surface / subsurface material in biomes ```json { "minHeight": 1, "terrainZoom": 5, "maxHeight": 1, "palette": ["GRASS_BLOCK"], "dispersion": "SCATTER" } ``` ## dispersion > The dispersion of materials from the palette ## minHeight > The min thickness of this layer ## maxHeight > The max thickness of this layer ## terrainZoom > The terrain zoom mostly for zooming in on a wispy palette ## palette > The palette of blocks to be used in this layer