Marker Proposed for the Start of the Anthropocene Epoch: Canada's Crawford Lake

The University of Southampton has an announcement. Slashdot reader pyroclast shared this report from ScienceDaily:Today an international team of researchers has chosen the location which best represents the beginnings of what could be a new geological epoch, the Anthropocene. The Anthropocene Working Group have put forward Crawford Lake, in Canada, as a Global Boundary Stratotype Section and Point (GSSP) for the Anthropocene. A GSSP is an internationally agreed-upon reference point to show the start of a new geological period or epoch in layers of rock that have built up through the ages. It's been proposed by some geologists that we are now living in the Anthropocene - a new geological epoch in which human activity has become the dominant influence on the world's climate and environment. The concept has significant implications for how we consider our impact on the planet. But there is disagreement in the scientific community about when the Anthropocene began, how it is evidenced and whether human influence has been substantial enough to constitute a new geological age, which usually span millions of years. To help answer these questions, the International Commission on Stratigraphy (ICS) set up the Anthropocene Working Group. "The sediments found at the bottom of Crawford Lake provide an exquisite record of recent environmental change over the last millennia," says Dr Simon Turner, Secretary of the Anthropocene Working Group from UCL. "Seasonal changes in water chemistry and ecology have created annual layers that can be sampled for multiple markers of historical human activity. It is this ability to precisely record and store this information as a geological archive that can be matched to historical global environmental changes which make sites such as Crawford Lake so important...." Professor Andrew Cundy, Chair in Environmental Radiochemistry at the University of Southampton and member of the Anthropocene Working Group, explains: "The presence of plutonium gives us a stark indicator of when humanity became such a dominant force that it could leave a unique global 'fingerprint' on our planet. In nature, plutonium is only present in trace amounts. But in the early-1950s, when the first hydrogen bomb tests took place, we see an unprecedented increase and then spike in the levels of plutonium in core samples from around the world. We then see a decline in plutonium from the mid-1960s onwards when the Nuclear Test-Ban Treaty came into effect." Other geological indicators of human activity include high levels of ash from coal-fired power stations, high concentrations of heavy metals, such as lead, and the presence of plastic fibres and fragments. These coincide with 'The Great Acceleration' - a dramatic surge across a range of human activity, from transportation to energy use, starting in the mid-20th century and continuing today. "Evidence from the sites will now be presented to the International Commission on Stratigraphy, which will decide next year whether to ratify the Anthropocene as a new geological epoch."

Read more of this story at Slashdot.