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In page Bread:

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Bread is one of the oldest prepared foods.[citation needed] Evidence from 30,000 years ago in Europe and Australia revealed starch residue on rocks used for pounding plants.[1][2] It is possible that during this time, starch extract from the roots of plants, such as cattails and ferns, was spread on a flat rock, placed over a fire and cooked into a primitive form of flatbread. The oldest evidence of bread-making has been found in a 14,500-year-old Natufian site in Jordan's northeastern desert.[3][4] Around 10,000 BC, with the dawn of the Neolithic age and the spread of agriculture, grains became the mainstay of making bread. Yeast spores are ubiquitous, including on the surface of cereal grains, so any dough left to rest leavens naturally.[5]