Step by Step
1
What ceramics are made of
Pottery is made from clay mixed with temper — material added to the clay before firing specifically to prevent cracking (common tempers include grit, crushed shell, or plant fiber).
2
How pottery is formed and fired
Vessels can be hand-built or wheel-thrown. Firing temperature also varies: low-fired pottery (earthenware) versus high-fired pottery (stoneware and porcelain, which require hotter kilns and produce a harder, less porous final product).
3
What archaeologists analyze
Vessel form (shape), decoration, temper material, paste (the clay body itself), and firing temperature are all analyzed to characterize and compare pottery finds.
4
Neutron activation analysis
A chemical technique that identifies the specific geological source of the clay used in a pottery vessel, by analyzing trace elements — this can reveal whether a vessel was made locally or brought in from elsewhere, offering evidence about trade and exchange networks.
5
Seriation using pottery
Because pottery styles (decoration, shape) change gradually and often go in and out of fashion over time, tracking those style changes across a sequence of layers or graves (seriation, covered in an earlier lesson) is one of the most powerful relative dating tools archaeologists have — precisely because pottery is so common and so stylistically variable.
Applied Walkthrough
1
An archaeologist excavating a site finds fragments of pottery at every layer.
2
By analyzing the temper (shifting from shell temper in lower layers to grit temper in upper layers) and decoration style (a particular painted pattern rising then falling in popularity through the sequence), they build a seriation chart that helps date undated layers at the same site or nearby sites showing similar patterns.
3
When neutron activation analysis reveals that the clay used doesn't match any local geological source, it suggests this pottery — or at least its raw material — was traded in from elsewhere, adding evidence about this community's exchange networks.
Exam Application
Exams test whether you can explain what temper is and why it's needed, distinguish earthenware from stoneware/porcelain, and what neutron activation analysis reveals, as distinct from dating methods.
⚠ Common Trap
Don't assume all pottery analysis is about dating alone — neutron activation analysis in particular is about tracing trade and sourcing, a separate question from when a piece was made.
✓ Quick Self-Check
1. What is temper, and why is it added to clay?
Material (like grit, shell, or fiber) added to clay to prevent cracking during firing.
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2. What's the difference between earthenware and stoneware/porcelain?
Earthenware is low-fired; stoneware and porcelain are high-fired, producing a harder, less porous product.
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3. What does neutron activation analysis reveal about pottery?
The specific geological source of the clay, based on trace element chemistry — useful for tracing trade networks.
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4. Why is pottery seriation such a powerful relative dating tool?
Because pottery is extremely common at sites and its styles change in recognizable, trackable patterns over time.
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5. Name the five main things archaeologists analyze about a ceramic vessel.
Form, decoration, temper, paste, and firing temperature.
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