These photos show a cracked starch granule extracted from a hammer stone at the Nakanoyama site in Mie Prefecture. Its extinction crosses were degraded by microorganisms in the soil environment.
The above photos show another degradation of starch. This starch granule was extracted from carbonised plant fibres adhering to Jomon pottery at the Shimo-yakebe site in Tokyo. The contents including this plant was cooked with pottery. So the size of a starch granule became bigger and its extinction crosses were very unclear.
Starch degradation types can show functions of archaeological materials as well.
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