"On these timescales, we're not really great at refining an age for missing time exactly," says Francis Macdonald, Professor of Geology at the University of California, Santa Barbara, who was also involved in the research. "And so the previous theory suggested that okay, it's all being formed once, with glaciation – but we're saying 'no it's been formed over hundreds of millions of years'… when you get better data, they [the unconformities] are not exactly correlative."

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