A fossil pearl slightly bigger than a marble has been verified as more than 100 million years old in Richmond, Queensland. Researchers say it is the largest fossil pearl of its age confirmed in Australia and unusually well preserved. At nearly 2 centimeters across, it is a rare record of how an ancient animal responded to stress inside its shell, and it opens a window onto an inland sea that no longer exists.<\/p>\n\n\n\n
How does a pearl end up in the outback? Around 100 million years ago, Richmond sat about 40 meters underwater<\/a> beneath the inland Eromanga Sea, a shallow seaway that stretched from Cape York to northern New South Wales. That inland sea left a fossil-rich legacy.<\/p>\n\n\n\n The pearl began as a chance discovery in 2019, when a tourist dug in the fossil pits run by Richmond\u2019s Kronosaurus Korner museum. Long-time volunteer digger Barbara Flewelling accepted the odd, rounded find and said, \u201cI knew it was significant.\u201d Staffing changes and pandemic disruptions slowed the next step, and the specimen eventually reached the University of Queensland for verification.<\/p>\n\n\n\n Confirming a pearl is trickier than it sounds. A round fossil<\/a> could be many things. Gregory Webb, a University of Queensland paleontologist, said his team used non-destructive imaging<\/a> and other high-tech analysis so they could \u201clook inside it without damaging it\u201d and confirm it was truly a pearl. The process took close to two years, in part because specialized technology is in high demand and there are relatively few researchers who can do this kind of work.<\/p>\n\n\n\n Webb called the specimen \u201cincredibly valuable and extremely rare,\u201d and said it is \u201cone of the most significant finds for fossil mollusks in Australia for its huge size.\u201d The pearl has since been returned to Richmond and is now on display.<\/p>\n\n\n\n Pearls form when a bivalve gets an irritant inside its shell and responds by layering material around it. If you have ever had a grain of sand stuck in a shoe, you know how a tiny intruder can take over your day. Webb explained that ancient clams did what modern clams do. If something got inside, they would \u201csimply grow shell around it to protect themselves.\u201d<\/p>\n\n\n\n What makes this fossil stand out is how little it has changed. Webb said the pearl formed in a clamshell made of calcite<\/a>, a mineral he described as more stable than aragonite, which is what many modern pearls are largely made of. That stability likely helped the pearl survive with minimal alteration.<\/p>\n\n\n\n The clam behind it was an Inoceramus bivalve, common in the Cretaceous<\/a> period. These extinct clams could grow up to about 50 centimeters across in what is now outback Australia.<\/p>\n\n\n\n It is easy to see the pearl as a museum showpiece. But Webb said it also helps answer bigger questions about how life reacts when conditions shift.<\/p>\n\n\n\n \u201cBy looking at how ancient biology, ecosystems and individual communities adapted to things that were changing around them, it gives us a better understanding of how our modern biology reacts as well,\u201d he said. \u201cThat helps us project what might happen in the future.\u201d<\/p>\n\n\n\nRead More: Scientists agree on this and are issuing a serious warning: these bats could be behind a future epidemic in the most affected areas of the planet<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
Verifying a fossil without breaking it<\/h2>\n\n\n\n
Why this pearl stayed so well preserved<\/h2>\n\n\n\n
A small fossil with a climate message<\/h2>\n\n\n\n
Read More: Scientists agree on this and are issuing a serious warning: these bats could be behind a future epidemic in the most affected areas of the planet<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n