Explore the isotopic signatures of atmospheric molecular oxygen in geological materials through this 26-minute conference talk presented by Andreas Pack at the Mineralogical Society of America's Short Course on Triple Oxygen Isotope Geochemistry. Delve into topics such as the atmosphere, cap delta 17O, oxidation processes, sedimentary sulfate, magnetite formation, body water composition, manganese nodules, tactiles, cosmic ferrules, and more. Gain insights into the application of triple oxygen isotope geochemistry in understanding Earth's geological history and atmospheric evolution.