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"roy denia" Discussed on The Science Show
"There's always uncertainty, but I guess one of the strengths of these studies that not only do we have silicon fingerprint. It was been working on the rocks themselves were deposited in very similar environments and Rivera similar ages. So when you start to add up all these different lines of evidence, he can be more confident at indeed, these Tasmanian, Arizonan rooks are very similar. How useful is this information? It's a very useful discovery for a lot of people because it helps us understand the continents about a billion years ago during these Tommy unearth history, must've this contents think we're assembled together in a supercontinent codeine a- and people have debated about how the different continents were arranged within that supercontinent and the. Died of from Tasmania helps link Tasmania and what parts of astrology in Antarctica onto that Wisden margin of the US. So that's exciting discovery. Does this information and this idea feet with what was previously thought? Or is it a completely new idea? Well, it builds on extensive body of work. That's probably really started to get going around the early ninety s on this continent, ROY Denia. So one of the most controversial aspects what continents were assembled along the margin of the west in US. There's a number of different models that have been put forward these include sticking, Australia and Antarctica against that margin. Are the papers stick some blocks in China and threat is you along that margin and the new data from Tasmania privileged support? I think to the kind of a strategy and a stand Taty connection with west and US and narrows, Dan, the relative configuration of those books. So it's not. A completely new model, but it is building and provides some important geological support to previously propose motives, if you've got an idea why there was a supercontinent. I mean, why should the planet have way back as you say in deep time. Why should they have been just one land mess? Look that is one of the big questions and share science sciences. What drives the super continent circle because we haven't just had one of those sober continents. We seem to get them every four to five hundred million years. The continents will join together into these large landmasses and the fundamental driving mechanisms for that process still caught polling on so we make all assembled together again in the future. Absolutely. And we've already named the Knicks supercontinent, and that's code a major it's happening again absolutely beginning now on the present dialogue in the middle of a supercontinent circle. So we call the supercontinent cycles the time from one super continent. Fully assembled it. Tim breaks up the different continents. Drift apart. And then they coalesce into another super continents becomes circle the present day distribution of continents on our planet, largely reflects the breakup of the supercontinent Panja, so we're heading for a new one. How many times has it happened in the past? That's again, something that's debated. But we think the first tree supercontinent was probably formed between about one point five and might be too believes ago that one was code. No no known abroad Cup. The different continents drifted apart. And they came together to form ROY Denia. So that's super contin number two billion years ago in Rudeina broke up and began to assemble into the landmass code Gondwana, which is debated supercontinent bit essentially Gondwana eventually collided with North American film Panja. So there's three maybe four super confidence that most of the geological community would agree on. And this speculation. They might have been some even older ones. But as you get back in time, you get fewer rocks to work with said as things become even more speculative. It's a fascinating story getting back to the site in Tasmania, can you just place it for us where this our croppies? These are not a sacred is not absolutely not one of the great things about those rock scene has various to get to. And the quite literally in papers backyard is probably the best plus two. So these rocks is along the northwest coast between Wynyard and say Stanley all along the coastline there in places like boat..