This appears to be how they computed the date: https://en.wikipedia.org/wiki/K%E... | Hacker News

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wumpus on Aug 20, 2017 | parent | context | favorite | on: Scientists Find Record 2.7M-Year-Old Ice Core in A...

This appears to be how they computed the date: https://en.wikipedia.org/wiki/K%E2%80%93Ar_dating

With just 1 sample they can't conclude much, but if they find a bunch of others, they'll have an interesting set of datapoints from the composition of the tiny air pockets in the ice.

llccbb on Aug 21, 2017 [–]

You can read more in this open-access PNAS article[0].

[0]http://www.pnas.org/content/105/24/8232.full

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