55-million-year-old penguin fossils reveal chemical clues about Antarctica before freezing

PC: Eocene penguin fossils as archives of Antarctic weathering and climate change: insights from micro-X-ray fluorescence elemental mapping Fifty-five million years ago, Antarctica looked nothing like the frozen continent we know today. Its coastlines were warm and humid, its shores home to some of the earliest penguins ever to exist, and its rocks were quietly recording every shift in climate that followed. Now, scientists studying penguin fossils unearthed on Seymour Island have found that these ancient bones hold onto far more than shape and structure. Using a non-destructive scanning technique called micro-XRF, researchers from the China University of Geosciences in Beijing mapped the chemical make-up of skeletons spanning tens of millions of years, comparing them against modern penguin bone for contrast. What they uncovered was a hidden archive written in trace elements, one that tracks changing weathering patterns, shifting sea conditions and fluctuating oxygen levels as Antarctica cooled from greenhouse warmth into the earliest stages of glaciation, all preserved inside the bones of birds that never left.How 55 million years old penguin fossils reveal Antarctica’s climate ch...