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Traces of starch found on a large flat stone discovered in the hunter-fisher-gatherer site of Ohalo II famously represent the first identification of Upper Palaeolithic grinding of grasses. Given the importance of this discovery for the use of edible grain, further analyses have now been undertaken. Meticulous sampling combined with good preservation allow the authors to demonstrate that the Ohalo II stone was certainly used for the routine processing of wild cereals, wheat, barley and now oats among them, around 23 000 years ago.
Nadel et al. (Sat,) studied this question.