 Solheim's chronological chart suggests that "incipient agriculture" began about 20,000 years BCE in Southeast Asia.He also suggests that ceramic technology was invented at 13,000 years BCE although Spirit Cave does not have ceramics evident until after 6,800 years BCE.Although Solheim concludes that his reconstruction is "largely hypothetical", his overstatement of the results of Gorman's excavation has led to inflated claims of Hoabinhian agriculture.