The official marker for the start of a new Anthropocene epoch should be a small Canadian lake whose sediments capture chemical traces of the fallout from nuclear bombs and other forms of environmental degradation
The work to define an age of human impacts has taken “a tremendous amount of effort, to solve a problem that I don’t think exists”, adds Jacquelyn Gill, a palaeoecologist at the University of Maine in Orono. “We all already know what we mean when we say the Anthropocene.”
Both lakes contain annual sediment layers that capture environmental changes over time. But unlike Crawford, which reflects the influence of nearby Toronto, Sihailongwan is relatively undisturbed by local influences and thus contains a broader record of change, says Yongmin Han, a geochemist at the Institute of Earth Environment of the Chinese Academy of Sciences in X’ian.
Years are marked in the core by layers of calcium carbonate, which sinks to the bottom during summer.Previous studies of the lake’s sediments revealed two major periods of change: one lasting from the thirteenth to fifteenth century, when Indigenous peoples speaking the Iroquois language lived in the area, and another beginning in the nineteenth century, marking the arrival of European colonists.
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