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+I see that the state this mod is now is horrible. Now, as I passed my final 
+exams, i decided to spend more time on this. Since I cannot write a 
+complete geological simulator, I decided on the following strategy:
+
+1. Under like 5km generate only igneous rocks.
+2. Abowe that generate sandstone, that will serve as placeholder for more rocks.
+3. Generate a fixed amout of layers of rocks there.
+   - some igneous layers could represent lava spills
+   - including metamorphic rocks
+4. Shift everything around (possibly multiple times) to simulate faults.
+5. Create some intrusions (name?) and underground volcanic activity.
+6. Create some veins.
+
+Using 2d noise as heightmap has one notable advantage: Looping over 80*80 
+nodes is faster than 80*80*80.
+
+Minecraft mods I inspire from: Geologica, SGU bettergeo, geocraft.
+
+Doing a complete geological mapgen could be possible too: Start with plate 
+tectonics, deposit rock in layer on top of each other, do some faults and 
+folding inbetween, put soil on top. This could produce an interesting 
+landscape.
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