Shaelyn Silverman is presenting a poster on Measuring Ancient Air Pressure Using Fossilized Cyanobacteria (Abstract ID 121646) on work that is part of her Senior Thesis at CU Boulder together with Sanjoy Som (NASA Ames). Allison Lee is presenting a poster on how Iron availability influences 15N-isotope fractionation during nitrogen fixation by aerobic chemoheterotroph Azotobacter vinelandii (Abstract ID 184186) on work that is part of her undergraduate research in Xinning Zhang’s new lab at Princeton University. First time at AGU, congratulations to both and have a great time at the conference!