My research uses paleoenvironmental archives to expand our knowledge of climate and environmental perturbations during the recent past. Specifically, I am interested in understanding how rapid changes in climate, land-use, and pollution affect aquatic biogeochemistry. Establishing historical and fossil baselines can be useful for evaluating these effects. Therefore, I examine biogenic carbonates (clam, mussel, & snail shells) as environmental archives, a field called sclerochronology (analogous to dendrochronology). Specifically, I focus on how geochemical variations in mollusc shells record environmental conditions.