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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.
Published today in the Alcheringa: An Australasian Journal of Palaeontology, evidence of an "Age of Monotremes" has been unearthed by a team of Australian scientists at the Australian Museum (AM), Museums Victoria and Australian Opal Centre.