Lost era of monotremes revealed by fossils from 100 million years ago
As the bones locked in the rocks rotted away, water-based silica seeped into the crevices, solidified into opal and preserved precious details for 100 million years. The resulting fossils now provide evidence that there may really have been an age of monotremes, before other mammals took over. “It’s like discovering a whole new civilisation,” says … Read more