Lost Age of Monotremes Revealed by Fossils From 100 Million Years AgoLost Age of Monotremes Revealed by Fossils From 100 Million Years Ago - ScienceAlert
sciencealert.comSubmitted by sciencealert6623 in science
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.