Crawford Lake is in Milton, Ontario, a Toronto suburb that is home to more than 124,000 people. The lake is close to 80 feet deep, according to the Anthropocene Working Group, and the sediments at its bottom form annual layers that record human interactions with the environment over the past thousand years. Crawford Lake was among a dozen “golden spike” candidate sites that show evidence of the same simultaneous surge in human pollution around 1950, The Post reported. A “golden spike” refers to a spot in the geologic record where proof of a global transformation is perfectly preserved. This week, the Anthropocene Working Group’s 22 voting members announced that Crawford Lake best shows the geological shift that has taken place as a result of human activities. The lake holds evidence of nuclear fallout, industrial pollution, species extinctions and global warming.