How Archaeologists Study Ancient Settlements

Heritage · History, heritage and archaeology · 2 min read · Researched guide · Last updated 2026-10-23

In short: Archaeologists read a settlement by its layers. Stratigraphy treats each deposit, wall or cut as a context, and in an undisturbed sequence upper layers are younger. Radiocarbon dating can date organic material up to about 50,000 years but needs calibration and careful sampling.

Quick facts

Contexts and layers

A context is a single event or action that leaves a trace: deposits (like the fill of a ditch), structures (walls) and cuts (digging that removes earlier material). Their relationships show the order of events; a Harris matrix diagram maps them.

Dating

• Relative dating: a context between two datable layers falls between their dates.
• Latest-evidence rule: a layer is no older than its latest artefact, since older items can be reused or redeposited.
• Radiocarbon: dates wood, charcoal, bone, shell, seeds and charred food residue; it needs calibration.

Limits

Modern contamination makes samples look younger, old carbon can make them look older, marine and freshwater organisms can appear very old, and old wood can pre-date the event it dates. Reported 1-sigma ranges cover only about 68% confidence.

As a visitor

When a sign gives a date, ask how it was obtained. Apply this at Dholavira or Lothal, and read how to interpret historical claims.

Check before you go

This is a researched guide, not medical, legal or mechanical advice. Rules, permits, closures and fees change. Confirm locally before you travel.

Frequently asked questions

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Rules, closures, fees and conditions change. Confirm with the relevant authority before you travel, and treat this guide as planning help, not a substitute for local advice.