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.
ทางเข้าเว็บแทงบอลออนไลน์ 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.
