Why is there a large stone area in my desert?

Question

So after loading a new map for 1.8 I found a desert. In the desert is a few spots where there is no sand but a blank stone face with assorted dirt, coal, etc. There is sand nearby and it gradually drops to this spot. The average height of these are y = 66. Is this just a feature of the desert biome or do others have this feature too?

Also you can see it across the river in my forest biome.

Answer

Like in real life, sometime the terrain generator makes spots of exposed stone on the surface. This seems a bit counterintuitive in a desert, but it can happen in any biome.

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