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![Hunting for fossils: Mine owner Bob Foster displays fossil dinosaur remains found in an opal mine at "the Sheepyards" mine area Lightning Ridge, southern Australia. Fossil excavations usually follow existing mining operations. The seam of opal-bearing rock is about 100-120 million years old, laid down during the mid-Cretaceous Period, a time of rich diversification of dinosaur species. Australian fossils are particularly interesting, as at that time the continent was much closer to the South Pole than today. This means that many dinosaurs would have had to cope with long periods of permanent darkness during the winter months. MODEL RELEASED [1989].](https://m.psecn.photoshelter.com/img-get2/I0000Ocn3s4vMSXQ/fill=/fit=180x180/I0000Ocn3s4vMSXQ.jpg)
![An opal miner displays a handful of opals. Opal is a form of hydrous silicon oxide. The stones are conglomerates of microscopic spherical particles - opal is never found as a true crystal. The blue/green and dark blue forms seen here are considered to be precious. Opal has a beautiful colored luster due to the varied dispersion of light from its structure. Opal may also be seen in fossils, where it replaces the organic matter (especially bones) in buried remains. These stones were photographed at Lightning Ridge in Australia, the world's most important source of precious opal. [1989].](https://m.psecn.photoshelter.com/img-get2/I0000PPWZw06rSaU/fill=/fit=180x180/I0000PPWZw06rSaU.jpg)
![Hunting for fossils: Mine owner Bob Foster displays fossil dinosaur remains found in an opal mine at "he Sheepyards" mine area of Lightning Ridge, southern Australia. Fossil excavations usually follow existing mining operations. The seam of opal-bearing rock is about 100-120 million years old, laid down during the mid-Cretaceous Period, a time of rich diversification of dinosaur species. Australian fossils are particularly interesting, as at that time the continent was much closer to the South Pole than today. This means that many dinosaurs would have had to cope with long periods of permanent darkness during the winter months. MODEL RELEASED [1989].](https://m.psecn.photoshelter.com/img-get2/I00008gAF81RDTgY/fill=/fit=180x180/I00008gAF81RDTgY.jpg)
![Coober Pedy Opal Mine, Southern Australia. Opal is a form of hydrous silicon oxide. The stones are conglomerates of microscopic spherical particles - opal is never found as a true crystal. The blue/green and dark blue forms seen here are considered to be precious. Opal has a beautiful colored luster due to the varied dispersion of light from its structure. Opal may also be seen in fossils, where it replaces the organic matter (especially bones) in buried remains. [1989]](https://m.psecn.photoshelter.com/img-get2/I0000fCAZROH9VjM/fill=/fit=180x180/I0000fCAZROH9VjM.jpg)
![Robert T. Gregory of Monash University in Melbourne, Australia performs oxygen isotope ratio research on Australian dinosaur bone fragments found at a research dig at Dinosaur Cove on Cape Otway, Australia. MODEL RELEASED [1989]](https://m.psecn.photoshelter.com/img-get2/I0000cLaspp8eKkA/fill=/fit=180x180/I0000cLaspp8eKkA.jpg)
