Scientists looking at some of the first rocks to be dated have decided that rocks which had taken “10 million years” to form — instead found under study that “most of the formations originated during the Ireviken event, which lasted for only 1 million years or so.”
Really, that replaces about 10 megayears with “only 1 million years or so”, and since many, many other rocks are dated based on these ages, it looks like much other rock is about to lose 9 million or so years.
What surprises me is that they’re basing these dates on “the ratio between two isotopes of carbon, carbon-13 and carbon-12, in a rock sample,” but carbon isotopes decay fairly fast — maybe 100 kiloyears tops — so I wonder about this being used on rock which is aged at hundreds of millions of years old. Well, perhaps that’s another thing that will be re-considered while they’re analysing everything.
It’s going to be interestig to see what various implications arise (what ideas change) as rocks with formally “certain” dates gradually get new birthdays. Will formations change as a unit, or will parts “move” relative to the rest? What events are going to swap places? What pet theories will have to find new homes?