Confused by lootstage cap & biome badges. What part of this am I misunderstanding?

As you are well aware, I will whip up a mod if I think something needs changing or improving, but I have never had a reason to mod the oil shale deposit color on the maps. They stand out fairly well against the yellow biome color.
Are they the little purpley spots? I don't mine oil shale often enough to remember what color they are, but I know when I did the Desert badge the first time after 2.0, I had trouble finding oil shale.
 
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