Sediment deposited at Crawford Lake, a small but deep body of water in Canada's Ontario province, provides unmistakable evidence that Earth entered a new human-driven geological chapter - the Anthropocene epoch - some seven decades ago, a team of scientists said on Tuesday.
The members of the Anthropocene Working Group plan to submit the evidence to the international scientific body responsible for naming geological chapters in Earth's history. The scientists conductedat a dozen sites worldwide and cited Crawford Lake, near Toronto, as the location that provided particularly persuasive geological markers that the Anthropocene epoch - essentially the age of humans - has arrived.
The Anthropocene epoch has not yet been formally recognised by a scientific body called the International Commission on Stratigraphy. The Anthropocene, if it gains formal recognition, would follow the Holocene epoch, which began 11,700 years at the conclusion of the last Ice Age. The sediment at Crawford Lake, the scientists said, showed a "golden spike" illustrating a sudden - in geological terms - and irreversible shift in Earth's conditions. Such golden spikes - formally ending one geological chapter and ushering in another - would be observable in rock, glaciers or marine sediments for thousands of years to come.
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