Canadian lake identified as the \u0027golden\u002Dspike\u0027, a spot in the geologic record that preserved the transformation humans have wrought
A group of scientists said Tuesday the best evidence for humanity’s overwhelming impact on the planet could be found at Crawford Lake in Milton, Ontario. The lake’s finely layered sediments contain a thousand-year record of environmental history, culminating in an explosion of man-made disruption around the middle of the 20th century.
Before the Anthropocene can be added to Earth’s 4.6-billion-year official timeline, it must withstand the scrutiny of the wider geology community. In the coming months, the proposal will go before the Subcommission on Quaternary Stratigraphy, which is responsible for subdividing the history of the last 2.4 million years. Then the larger International Commission on Stratigraphy will vote.
The distinct years of sediment deposits are visible in this section of sediment collected from the bottom of Crawford Lake by a team of scientists from Carleton and Brock Universities near Milton, Ontario, Canada, April 12, 2023.But after months of deliberation, the working group’s 22 voting members – including McCarthy and Waters – decided that Crawford Lake captured the evidence for the Anthropocene better than anywhere else.
Tim Patterson , Professor of Geology at Carleton University, left, leads a team of scientists as they retrieve a probe from the bottom of Crawford Lake while gathering sediment layer samples at Crawford Lake near Milton, Ontario, Canada, April 12, 2023.Other researchers worry that giving the Anthropocene a strict geologic definition may have ripple effects far beyond the hidebound halls of academia.
“No one that I know that’s been critical of the Anthropocene wants to deny the effects of humans on the Earth system,” Bauer said. He is among a group of scientists who have proposed that the concept be defined as geologic “event,” rather than an epoch – a more flexible term that could encompass all the nuanced ways people have reshaped and been shaped by nature over thousands of years.
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