Chronostratigraphy is a branch of geology that involves the study of the relative timing and relationships of rock layers or strata. It focuses on determining the chronological sequence of events that have occurred in a particular area over time, with the goal of creating a timeline or "chronostratigraphic framework" for understanding the Earth's geological history. By examining the sequence of rock layers and their fossil content, researchers can correlate and date different sedimentary sequences, providing insights into past environmental conditions, evolutionary changes, and Earth processes. Chronostratigraphy is a fundamental part of the study of stratigraphy, which is the branch of geology that deals with the spatial and temporal relationships of rock strata and their interpretation.