Congo/S?o Francisco puzzle piece fit in the jigsaw that made up Nuna. In 1.5-billion-year-old rocks in Brazil,
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, she unearthed magnetic clues that placed the Congo/S?o Francisco craton at the southeastern tip of Baltica all those years ago. She and her colleagues reported the findings in November in Precambrian Research,
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.
It is the first time scientists have gotten paleomagnetic information about where the craton may have been as far back as Nuna. “This is quite remarkable — it was really needed,
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,” she says. “Now we can say Congo could have been there.” Like building out a jigsaw puzzle from its center, the work essentially expands Nuna’s core.
Rodinia’s radioactive decay
By around 1.3 billion years ago, Nuna was breaking apart, the pieces of the Mona Lisa face shattering and drifting away from each other. It took another 200 million years before they rejoined in the configuration known as Rodinia.
Recent research suggests that Rodinia may not have looked much different than Nuna,
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, though. The Mona Lisa in its second incarnation may still have looked like the portrait of a woman — just maybe with a set of earrings dangling from her lobes.
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.jpg" style="float: right,
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; width: 350px,
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; height: 405px;" title="Volcanic features called dikes form when molten rock squirts into a crack and cools to form a long sheetlike feature,
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. Matching dikes of the same age and chemical composition across continents can

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