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Geological epochs are long periods of time — typically lasting around two million years — separated by major, global changes to the planet, such as the massive exploding meteor that ended the Late Cretaceous and wiped out the dinosaurs.
'They've left a permanent record in our sediments and our soils and our glacial ice that's going to be detectable for millennia.'
- Colin Waters, Anthropocene Working Group
Modern humans arose during the Pleistocene epoch, and since the sudden warming that ended the last ice age about 12,000 years ago, we had been living in the Holocene epoch.
But modern human technology has had such a profound effect on our planet that we're now in a new epoch that started during the mid-20th century — the Anthropocene, argues an international group of researchers in a new paper published today in the journal Science.
The boundary between two epochs is visible to geologists as some kind of "marker" between layers of rock, soil or ice that are deposited all over the Earth over time. For example, the Late Cretaceous-ending meteor left a distinct layer of iridium.
In the case of the Anthropocene, scientists note that humans have produced unusual materials like radioactive fallout from nuclear tests in the 1950s and 1960s."They've left a permanent record in our sediments and our soils and our glacial ice that's going to be detectable for millennia," said Colin Waters, a geologist with the British Geological Survey and secretary of the Anthropocene Working Group, whose members authored the new report.
"Geologists in millions of years time will look back at and say, 'Something quite incredible happened at this time' and be quite precise about when it happened."
"Geologists in millions of years time will look back at and say, 'Something quite incredible happened at this time' and be quite precise about when it happened."
The study, co-authored by 24 members of the Anthropocene Working Group, shows that humans have changed the Earth system sufficiently to produce a range of signals in sediments and ice, and these are sufficiently distinctive to justify recognition of an Anthropocene Epoch in the Geological Time Scale. In 2016 the Anthropocene Working Group will gather more evidence on the Anthropocene, which will help inform recommendations on whether this new time unit should be formalized and, if so, how it might be defined and characterized.
A number of UK members of the group have contributed to this study, Colin Waters (lead author and Secretary of the group) and Michael Ellis, both from the British Geological Survey, Jan Zalasiewicz, Mark Williams and Matt Edgeworth from Leicester University and Colin Summerhayes from Cambridge University have provided significant input to this study and maintain the UK's strong involvement in research into the Anthropocene concept.
originally posted by: gosseyn
What I find interesting is how with ice cores we can tell when people on this planet started to significantly pollute the atmosphere, and it started thousands of years ago, with the production of copper and other metals.
news.sciencemag.org...