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Geologists matching rock from the opposite side of the globe have found that part of Australia was once attached to North America 1.7 billion years ago.
Researchers from Curtin University in Australia examined rocks to an Georgetown region of northern Queensland. The rocks — sandstone sedimentary rocks that formed in a shallow sea — had signatures that were unknownin Australia but strongly resembled rocks that can be seen in present-day Canada.
The researchers, who described findings online in Jan. 17 in the journal Geology, concluded that the Georgetown area broke away from North America 1.7 billion years ago. Then, 100 million years later, this landmass has collided with what is now northern Australia, at the Mount Isa region.
"This was an critical part of global continental reorganization when almost all continents on Earth assembled to form the supercontinent called Nuna," Adam Nordsvan, Curtin University doctoral student and lead author of the study, said in a statement.
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