Integrating novel geochemical tools with traditional sedimentology and stratigraphy, I study the evolution of Earth’s oceans and atmosphere during the Precambrian. In particular, I focus my research on understanding basic interactions between the carbon cycle, the ocean’s redox structure, and continental weathering during the mid-Proterozoic. Preceding the environmental turmoil and rapid biological innovations that characterized the Neoproterozoic, the Paleo- and Mesoproterozoic were a time of apparent prolonged biological and geochemical stability. Despite a recent upswing in work on the early Proterozoic, basic aspects of Earth’s environmental conditions during this time period remain poorly known, hindering attempts at developing an integrated understanding of the late Proterozoic. In focusing on this period, I aim to better understand the underlying mechanisms which drove the mid-Proterozoic’s climatic and geochemical stability.