I remember seeing an opalised plesiosaur in a gallery as a child visiting White Cliffs. I always found that amazing, to find a combination of an already remarka

I remember seeing an opalised plesiosaur in a gallery as a child visiting White Cliffs. I always found that amazing, to find a combination of an already remarkable ancient fossil and then add opal. https://www.google.com/search?q=opalised+plesiosaur&source=lnms&tbm=isch https://www.google.com/search?q=opalised+plesiosaur&source=l... Opalised ammonites also: https://www.google.com/search?q=opalised+ammonite+&tbm=isch https://www.google.com/search?q=opalised+ammonite+&tbm=isch