Relative Dating Methods in Anthropology – UPSC Notes
Introduction
Dating methods are essential in the Anthropology Optional UPSC as they help determine the chronological sequence of cultural remains. While absolute dating methods provide exact dates, relative dating methods establish whether an object or site is older or younger compared to another.
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Major Relative Dating Methods
1. Stratigraphy
- Analysis of a series of layers in the horizontal dimension studied in vertical time sequence.
- Based on the principle that earlier deposits lie beneath later deposits.
- Stratigraphic associations of artefacts help determine the relative age of cultural levels.
2. Typology
- Archaeological sites mainly consist of artefacts and tools.
- Tools are classified on the basis of shape, preservation, or refinement.
- Presumption: simple, crude tools are earlier; refined ones are later.
- Criticism: Typology is often local rather than universal (Wheeler).
- Useful when corroborated with stratigraphy.
3. Sequence Dating
- Developed in 1881 by Sir Flinders Petrie in Egypt.
- Based on predictable changes in artefacts, especially pottery.
- Pottery designs traced in sequence → functional to decorative.
- Applied by A.L. Kroeber in the U.S., Mexico, and Peru to date sites.
4. Cross Dating
- Compares artefacts from different stratigraphic levels.
- Assumption: similar artefacts are contemporary.
- Best for objects like coins, pottery, arrowheads (short-lived horizon markers).
- Pottery types, due to frequent change, serve as index fossils.
5. Fluorine, Uranium, and Nitrogen Analysis
- Prehistoric sites often contain bone remains.
- Principle: the longer a bone is in soil, the more fluorine it absorbs.
- Bones from the same level → similar fluorine content → same age.
- Fluorine & uranium increase with time, nitrogen decreases.
- Helps sequence cultural phases, though not an absolute method.
6. Palaeontology
- Study of fossilised animal remains in archaeological sites.
- Climate changes affect animal presence/absence → indicates relative dating.
- Example:
- Elephas antiques → temperate climate.
- E. primigenius → tundra/glacial conditions.
- Elephas antiques → temperate climate.
- Extinctions (e.g., mammoth, camel, horse) in North America linked with human arrival (~6000 B.C).
- Smaller species (rodents, molluscs, snails) are more climate-sensitive → useful indicators.
7. Palynology (Pollen Analysis)
- Developed by Lennart Von Post (1916).
- Microscopic analysis of pollen grains to reconstruct vegetation.
- Pollen diagrams show changes in plant species and environment.
- Useful for dating archaeological sites by correlating pollen sequences.
- Example: Applied at Choukoutien, China.
8. Patination
- Refers to chemical alteration of stone surfaces due to environmental exposure.
- More patina → older artefact.
- Useful for tools in river gravels, terraces, and stratified deposits.
- Influenced by iron oxides and other chemical processes.
- Extensively studied by A.J.H. Goodwin (1960).
Conclusion
Relative dating methods provide archaeologists and anthropologists with a framework to establish the sequence of cultural development. From stratigraphy to pollen analysis, these techniques form the backbone of archaeological interpretation.
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