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A study published in Science Advances reveals a transcontinental river system from the Eocene era (44-34 million years ago) beneath Antarctic ice. Drill cores from the Amundsen Sea shelf show sediments from the mid-Cretaceous (85 million years ago) with temperate rainforest fossils and mid-to-late Eocene sand resembling a river delta. Biogeochemical data supports a paleoenvironment with significant riverine organic and siliciclastic material. Researchers suggest a >1500-km-long river system drained from the Transantarctic Mountains into the Amundsen Sea, supported by seismic reflection data.

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