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Organics: most likely Ord or Muck variety humus. Both carry very high CEC values (plasticity), as both absorb and hold moisture. Not uncommon for these materials to take several days longer to dry compared to commercial clay. You cab burn off Organics by heating up to 1150F. Organics may be the only plastic material in your wild clay: burning them off might have adverse effects. Testing is the only way to know. There is a Facebook group- "Wild Clay Club" devoted exclusively to processing/firing locally sourced clays. Not many threads about it on this site.

Tom

 

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