Scientists find perfect fossils in rust beneath Australian farmland

Iron-rich sediment in New South Wales preserves 11-16 million-year-old fossils, revealing a lost rainforest in astonishing cellular detail. | Contesto: cronaca

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• Scientists find perfect fossils in rust beneath Australian farmland

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Beneath the dry farmland of New South Wales, Australia, a hidden window into a lost rainforest teeming with life from 11 to 16 million years ago has been uncovered by scientists. At a site known as McGraths Flat, researchers have discovered fossils preserved in astonishing detail—not in typical rock like shale or sandstone, but in iron-rich sediment once thought incapable of such preservation. The find, reported this week, includes everything from insect organs to fish eye pigments and delicate spider hairs, all captured at the cellular level by tiny iron particles. The fossils date to the Miocene epoch, a time when the region was covered in lush rainforests rather than the arid farmland seen today. The preservation process, scientists explained, involved iron minerals that filled and encased individual cells, creating a three-dimensional record of ancient life. This mechanism allowed for the retention of soft tissues and microscopic features that rarely survive in the fossil record, offering an unprecedented glimpse into the ecosystem that thrived there millions of years ago. The significance of the discovery extends beyond the fossils themselves. Previously, iron-rich sediments were considered poor candidates for fossil preservation because they typically degrade organic material. However, the McGraths Flat specimens challenge that assumption, suggesting that similar deposits elsewhere could harbor equally well-preserved remains. Researchers are now analyzing the site to understand the specific chemical conditions that enabled such remarkable fossilization. The fossils include a diverse array of organisms, from plants and insects to fish and spiders. Notably, the preservation of eye pigments and delicate hairs provides clues about the behavior and ecology of these ancient creatures. For example, the structure of spider hairs can indicate how they moved or sensed their environment, while fish eye pigments reveal details about vision in the murky waters of the prehistoric rainforest. This discovery also has broader implications for paleontology and climate science. By reconstructing the lost rainforest ecosystem, scientists can better understand how Australia’s...

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Categoria: cronaca