The term 'stratigraphy' is a modern scientific compound, directly assembled from classical elements to describe a new discipline. Its first element, 'strat-', descends from the Latin 'stratum', meaning a spread or laid-down layer, which itself originates from the Proto-Indo-European root stere- meaning "to spread." The suffix '-graphy' comes from the Greek '-graphia', denoting a descriptive science or method of recording. Literally meaning "the description of layers," the word was coined in the 19th century to formally name the geological science that studies rock strata (layers) to interpret Earth's history, a meaning that was later extended to archaeological deposits. The logic perfectly captures the field's core activity: writing or charting the sequence of layered rocks.

Structure: strat (layer) + i + graphy (writing, description) - strat: From Latin stratum, meaning "something spread or laid down," a layer or bed. In this word, it functions as the core root denoting layers or strata. - i: A connecting vowel, typically of Greek origin, used to join word elements. - graphy: From Greek -graphia, meaning "writing, description, or science." It functions as a suffix denoting a field of study or descriptive science.