As a geologist I will retort that if Minecraft environments had eroding surfaces like real life does then that bedrock would also be visible at the surface. Outcrops are just areas that are experiencing erosion rates faster than areas that are overlayed with soil. That said, there are a cool Minecraft programs for geological processes that have been shown to be educational.
OP must follow Rox News.
There is one comma in the whole picture and it is killing me
The first 3 layers (horizons) are A, B, and C, respectively. Ask me how I know
Geologists clearly use custom world generation rules.