Tephrostratigraphy is the study of volcanic ash layers (tephra) within the stratigraphic record, used to correlate and date sedimentary sequences. This method is significant in geology and archaeology for constructing precise chronological frameworks, correlating events across regions, and studying volcanic activity.
Source Lowe, D. J. (2011). “Tephrochronology and Its Application: A Review.” Quaternary Geochronology, 6(2), 107-153.