The images are in the google+ link.
You should not, however, see this in new worlds. There is a possibility though where sometimes chunks from a world aren't deleted when the world itself is from within Minecraft, so creating a new one with the same name sometimes uses those and new chunks creating the same sort of ordeal (in all my time playing, I've only ever experienced this once though, so even this shouldn't be a consistent thing).
They look similar, but not the same. Perhaps it is standard generation with some biomes? I looked around and could not find any post of this problem, probably because I only looked for information on those specific biomes.