8/31/2023 0 Comments Mud spike meaning![]() ![]() McCarthy says this characteristic, and the deepness of the lake, have enabled scientists to get an accurate record of the area’s human and natural history. Varves from the mid-20th century onward contain deposits of human-made byproducts such as plutonium-239, microplastics, fertilizers and fly ash.Ĭrawford Lake is classified as a meromictic lake, meaning its layers of water don’t intermix. “I’m happy not just for me, for my colleagues and their students from a number of institutions who have been working really hard, but frankly, I’m happy for the planet.”ĭuring their long-running research, the multi-institutional team gathered sediment from Crawford Lake through a process called ‘freeze coring’ in which organic material freezes to the outside of a hollow tube, filled with dry ice and ethanol, that is dropped into the lake’s muddy floor.įrom the cores, researchers can see annual layers of sediment called varves that resemble tree rings. ![]() “My main reaction to the news is relief,” says McCarthy. ![]() On July 11, the Anthropocene Working Group (AWG) - of which McCarthy and Head are voting members - announced its choice of Crawford Lake over 11 other possible sites as the location that best shows the boundary of the proposed Anthropocene, brought about by major changes to Earth through human activity. The pad mud should exhibit controllable fluid-loss characteristics to minimize filter-cake buildup across permeable sands.Two Brock University professors are among a body of international experts that has selected a location on Earth that will allow the Anthropocene to be defined as a new epoch in geologic time.īrock Professors of Earth Sciences Francine McCarthy and Martin Head, and Carleton University Professor of Earth Sciences Tim Patterson, head up a team that has been studying the geology of Crawford Lake in Milton, Ont., for many years.
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