Varves dating sedimentary strata
Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification).
A gap or missing strata in the geological record of an area is called a stratigraphic hiatus.
Key concepts in stratigraphy involve understanding how certain geometric relationships between rock layers arise and what these geometries imply about their original depositional environment.
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It is primarily used in the study of sedimentary and layered volcanic rocks.
Stratigraphy has two related subfields: lithostratigraphy (lithologic stratigraphy) and biostratigraphy (biologic stratigraphy).