Density layering
00_Air
01_sediment
02_coalPCM
03_coalGreta
04_volcanic_onshore
05_volcanic_offshore
05_basement

3D Underworld layering
00_Elevation_0.05
01_Top_Maules_CM
02_Base_Maules_CM
03_Base_Jurassic
04_Top_Jurassic_Coal
05_Base_Jurassic_Coal
06_Top_Greta_CM
07_Base_Greta_CM
08_Top_PCM
09_Base_PCM
10_Top_Reid_Dome_Beds
11_Base_Reid_Dome_Beds
12_Denison_Volcanics_northern
13_Denison_Volcanics_southern
14_Complete_Volcanics_Onshore
15_Offshore_Volcanics
16_Complete_Basement