The process of opalization refers to something turning into an opal — like for example, a big part of this fossil. Opalized ammonite fossils are formed through a unique geological process ...

One in a billion bones becomes a fossil — even fewer turn into opal. In a pocket of north-western New South Wales, two pioneering women are uncovering relics of our deep past. In a small room of ...

There are few fossils, but even they create controversy. The opal fields of Lightning Ridge in New South Wales have produced a few jaws and teeth of small monotremes. Steropodon and Kollikodon are ...