This space is dedicated to the study and documentation of key seminal papers that explore the main applications of trace elements, isotopes, and U-Pb geochronology. It serves as a repository for critical insights into the methodologies, advancements, and applications of these techniques in various fields, including paleoenvironmental reconstruction, geochemical fingerprinting, and the dating of geological events. By analyzing and making notes on these foundational studies, this collection aims to provide a comprehensive understanding of their significance and their influence on modern geochemical and geochronological research.