Creeks (New Sub-Biome)

In Minecraft, the world is always generated to be a IRL Earth look alike, but to take more steps toward that, the game will have to add the tinier details. To do that, we'll need creeks. Generation: Creeks generate near mountains and flow down from shallow hills near mountains. The streams flow downwards (with flowing water going down), and has rocky pathways inside the stream. The streams width would be very small like real life creeks, and would flow into rivers. Blocks: (River blocks), and Cobble for rocks in the stream Use: Not much use, but would be a cool aesthetic for world generation. But would be a safe haven for salmon.