New Temperature Calibrations and Validation Tests of 5- and 6-Methyl brGDGTs in Lake Sediment

James M Russell, Brown University, Providence, RI, United States, John W Williams, University of Wisconsin, Madison, WI, United States, Stephen T Jackson, United States Geological Survey, Southwest Climate Science Cent, Tucson, AZ, United States, Jaap S. Sinninghe Damsté, NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry, 't Horntje, Netherlands and Benjamin I Watson, University of Wisconsin, Department of Geography, Madison, WI, United States