{"id":52662,"date":"2018-08-15T13:27:13","date_gmt":"2018-08-15T17:27:13","guid":{"rendered":"https:\/\/brocku.ca\/brock-news\/?p=52662"},"modified":"2018-08-15T18:10:03","modified_gmt":"2018-08-15T22:10:03","slug":"brock-led-team-collects-samples-at-crawford-lake-to-explore-possible-anthropocene-reference-site","status":"publish","type":"post","link":"https:\/\/brocku.ca\/brock-news\/2018\/08\/brock-led-team-collects-samples-at-crawford-lake-to-explore-possible-anthropocene-reference-site\/","title":{"rendered":"Brock-led team collects samples at Crawford Lake to explore possible Anthropocene reference site"},"content":{"rendered":"

It\u2019s like taking a photograph of Earth every year for a thousand years.<\/p>\n

The difference is that the \u2018camera,\u2019 in this case, is a freeze core, a long, hollow aluminum tube filled with a mixture of dry ice and ethanol to cool it to minus 80 degrees Celsius.<\/p>\n

On Tuesday, Aug. 14, a group of researchers from three universities and led by Brock University Professor of Earth Sciences Francine McCarthy used a freeze core to gather layers of sediment spanning the last millennium from the bottom of Crawford Lake in Milton.<\/p>\n

\"\"<\/a>

Master\u2019s student Autumn Heyd (left) and PhD student Andrea Krueger were among a Brock University-led research team studying Crawford Lake in Milton to be a possible location to define a new geologic epoch called the Anthropocene.<\/p><\/div>\n

The professors and student researchers from Brock, Carleton and McMaster universities used the freeze cores to collect layers of sediments from the bottom of the oxygen-free depths of the lake, creating \u2018tree rings\u2019 of sorts.<\/p>\n

They collected the samples in the hopes of confirming a new episode in the world\u2019s geological time scale known as the Anthropocene<\/a>.<\/p>\n

Sediment and rock layers give scientists clues about the Earth\u2019s plant and animal life, human activity, and other details within the planet\u2019s geological time scale. Earth is officially in the Holocene, but the scientific community has identified the mid-20th century as being the start of the Anthropocene.<\/p>\n

\u201cBecause we have those annual layers of sediment in Crawford Lake, we can tell exactly when 1950 is. We can point to a layer and say, \u2018That\u2019s 1950,\u2019 then we have the ideal location,\u201d says McCarthy. \u201cHundreds of years from now, people will be able to come here to find 1950 and that\u2019s the important thing.\u201d<\/p>\n

Gesturing to the raft, McCarthy explains what lies ahead for the research.<\/p>\n

\u201cOver the next year or two, my colleagues and I, along with students, are going to be analyzing and comparing what went on before 1950 and after,\u201d says McCarthy.<\/p>\n

She points out that an obvious example of time stamping would be more lead in the sediment from before gasoline went unleaded.<\/p>\n

If they find what they\u2019re looking for in these sediments, the research team will make a submission to the Anthropocene Working Group (AWG), an international group charged with evaluating proposals on where evidence of the Anthropocene can be best seen.<\/p>\n

If the AWG were to vote in favour of using Crawford Lake, the proposal would then be evaluated by the International Subcommission on Quaternary Stratigraphy<\/a>, chaired by Brock Professor of Earth Sciences Martin Head.<\/p>\n

Head, who is also a member of the AWG, says that the Anthropocene is distinctive from the Holocene in that that human activities have shifted the way our planet is now behaving as an integrated system.<\/p>\n

This shift is known as the Great Acceleration, a mid-20th century phenomenon associated with global industrialization, commercialization and a huge increase in energy use.<\/p>\n

\u201cSince the beginning of the Anthropocene, we may have actually exceeded the ability of the Earth\u2019s system to self-regulate in ways that it did before, so that\u2019s why the Anthropocene is important on a number of different levels,\u201d he says.<\/p>\n

Brock researchers at Tuesday\u2019s sediment collection included McCarthy, Head, Professor of Geography and Tourism Studies Michael Pisaric, Biological Sciences PhD student Andrea Krueger and master\u2019s student Autumn Heyd.<\/p>\n

\"\"<\/a>

A Brock University-led research team lowers the freeze core into Lake Crawford to collect sediments as part of an effort to identify the lake as being a possible location to define a new geologic epoch called the Anthropocene.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

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