In history, archaeology and physical anthropology , the three-age system is a methodological concept adopted during the 19th century according to which artefacts and events of late prehistory and early history could be broadly ordered into a recognizable chronology. Thomsen , director of the Royal Museum of Nordic Antiquities in Copenhagen in office: , initially developed this categorization in the period to as a result of classifying the museum's collections chronologically - there resulted broad sequences with artefacts made successively of stone , bronze , and iron. The system appealed to British researchers working in the science of ethnology — they adopted it to establish race sequences for Britain's past based on cranial types. Although the craniological ethnology that formed its first scholarly context holds no scientific value, the relative chronology of the Stone Age , the Bronze Age and the Iron Age remains in use in a general public context,   and the three-ages concept underpins prehistoric chronology for Europe, the Mediterranean world and the Near East.
Relative dating | Article about relative dating by The Free Dictionary
The study of the history of marketing , as a discipline, is meaningful because it helps to define the baselines upon which change can be recognised and understand how the discipline evolves in response to those changes. Marketers tend to distinguish between the history of marketing practice and the history of marketing thought:. Although the history of marketing thought and the history of marketing practice are distinct fields of study, they intersect at different junctures. At the same time, marketing academics often develop new research methods or theories that are subsequently adopted by practitioners. Thus developments in marketing theory inform marketing practice and vice versa.
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A geological period is one of the several subdivisions of geologic time enabling cross-referencing of rocks and geologic events from place to place. These periods form elements of a hierarchy of divisions into which geologists have split the Earth's history. Eons and eras are larger subdivisions than periods while periods themselves may be divided into epochs and ages.