หัวข้อ: The Anthropocene: Canadian lake mud 'symbolic of human changes to Earth'

[momoko]

Scientists are trying to define a new geological time period to recognise the changes we've made to the planet, and Crawford is their model example.
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Its sediments have captured fallout from intense fossil fuel burning, and even the plutonium from bomb tests.

The muds would be symbolic of the onset of a proposed Anthropocene Epoch.

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Researchers want to acknowledge their significance by making them a "golden spike", or more properly a Global Boundary Stratotype Section and Point.

Other great transitions in geological time are associated with a GSSP. Often, it's literally a brass nail hammered into some cliff face deemed to be of major scientific importance.

But for Crawford, it would be a brass plaque next to a frozen section of the sediments, kept in a museum in the Canadian capital, Ottawa.

[FrankJScott]

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