Hiting the cover of a major scientific magazine "Nature" is viewed as an oustanding achievement. Tells a lot about the reputaion of the editorial board, isn't it ;D Two young Poles recently succeeded, as their findings are crucial for the timeline of life on Earth. In short, their finding demonstrate the tetrapods invaded solid land much much earlier then was till now taught.
The cover shows a trackway and an isolated footprint (highlighted with charcoal) that were made by early four-legged land vertebrates (tetrapods) almost 400 million years ago. That’s 18 million years older than the earliest known tetrapod body fossils, and 10 million years older than the oldest elpistostegids — Tiktaalik, Panderichthys and their relatives, seen as transitional forms between fishes and tetrapods. The hands on the right belong to Grzegorz Niedźwiedzki, first author of the paper reporting the finds. (CREDIT: Piotr Szrek)