This course is designed to present the concepts of sedimentary geochemistry and biogeochemistry, along with the framework to interpret elemental and mineralogical records in such organic rich mudstone sequences. This course will focus on concepts as opposed to quantitative analysis, though some computations and chemical reactions will be discussed as they relate to biogeochemistry and carbonate equilibria. In addition, this course will also define the cascade of biogeochemical zones associated with early oxidation of organic matter. These biogeochemical zones occur in numerous environments from shallow estuaries to the deep ocean, and are also highly variable depending on the depositional settings. Typical pore water profiles, chemical reactants and products will be covered. Geochemical cycling in organic rich sediments also generates authigenic minerals, which can be diagnostic of oxic versus dysoxic, and/or sulfidic (euxinic) sedimentary conditions. The archetypal authigenic minerals and their associated elemental composition will also be discussed in the context of interpreting redox history within a sedimentary basin.