Stratigraphy

Engraving from William Smith's monograph on identifying strata based on fossils

Chalk layers in Cyprus, showing sedimentary layering

Stratigraphy is a branch of geology which studies rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy includes two related subfields: lithologic stratigraphy or lithostratigraphy, and biologic stratigraphy or biostratigraphy.

单词	Stratigraphically
释义	Stratigraphically 英语百科 Stratigraphy Stratigraphy is a branch of geology which studies rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy includes two related subfields: lithologic stratigraphy or lithostratigraphy, and biologic stratigraphy or biostratigraphy.
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Stratigraphically

Stratigraphy