It's a bit of a wake-up call, said Malcolm T. McCulloch, a geochemist at the University of Western Australia and one of the scientists who worked on the new research.
By examining the chemical composition of their skeletons, which the creatures built up steadily over centuries, the researchers have pieced together a new history of those earliest decades of warming.
With the new findings, we may have brought things forward by about a decade, Dr. McCulloch said.
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