Types of biomarkers (molecular markers) to assess organic matter

Biomarkers are specific compounds characteristic of certain bodies, and their identification in natural environments allows inferences about the origin and evolution processes of organic matter. They are organic molecules which may be structurally related to a biological source, a biogeochemical process, or a specific geographical source. Geochemical markers provide information about sources, transport mechanisms, alterations, and sedimentation of organic matter. In addition, tracers must be stable during geochemical diagenesis, and easily detected in environmental samples. This review aims to show the use of different organic molecules used in the identification of organic matter.