Lost Age of Monotremes Revealed by Fossils From 100 Million

As bones encased in rock rotted away, water-borne silica seeped into the crevices, solidifying into opal and preserving precious details for 100 million years.

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Australia , Papua New Guinea , Lightning Ridge , New South Wales , Australian , Matthew Mccurry , Tim Flannery , Kris Helgen , Peter Shouten , Philip Jackson Darlington , Australian Museum , Papua New , James Woodford ,