His main post notes that there was cereal trade in Europe during the Mesolithic era, evidenced by cereals in Southern England, a few thousand years before the Neolithic revolution arrived in England allowing cereals to be grown locally there, and just a few centuries after these cereals were domesticated in the Near East and grown there.
This trade is somewhat less surprising when we note, while we are on the subject of floor and cereals and the sequence in which innovations took place, that flours made from wild grains long predate the domestication of cereals.
Flour is found, for example, in Utah about 10,000 years BP (long before any cereals were domesticated in the New World), and in Tuscany about 25,000 years BP, about 15,000 years before the Neolithic revolution in the Fertile Crescent.
Hunter-gatherers were turning wild plants into flour long before farming was invented.UPDATE December 13, 2015. The evidence for Mesolithic cereal trade in Europe turns out to have been flat wrong and the product of inaccurate dating of the evidence.
A find in Utah [citing this source] shows flour being produced 10,000 years ago (long before plants were domesticated in the New World). The "milled seeds include sage, salt bush and various grasses, which were processed on grindstones."
Research at the "Gravettian site of Bilancino, in Tuscany, Italy, which dates to about 25,000 BP uncal [about 28,000 BP on a calibrated basis]. . . . includes notably charcoal, pollen and starch grain recovered from the surface of a grindstone. . . . [T]he occupants of Bilancino had been grinding cattail (Typha latifolia), likely its roots, as well as wild grasses to produce flour."
Why does this matter?
[I]t "implies the availability of an elaborate product, a flour, with high energy content, that is rich in carbohydrates, easily storable and transportable, to make a kind of bread (biscuits) or a porridge" . . . This means that plant material could be preserved and stored for much longer periods of time, which effectively can provide carbs during seasons such as winter during which they are normally difficult if not impossible to obtain. Also, it provides a subsistence items that serves as a buffer against the fluctuating availability of other types of subsitence resources, such as animal tissue. Lastly, because flour is easily ingested and digested, it also provides a foodstuff that both very young and very old members of a group can consume - and maybe even produce while adults are off procuring other things. This means that survival to adulthood and into old age can be facilitated, which has the potential of significantly reorganizing the way labor is divided within a society, and increasing the generational knowledge available to given forager groups.These finds also further supports the evidence from a variety of sources that modern humans may have had proto-agricultural societies existed for thousands of years before plants were domesticated in a way that made them more useful and permitted a more settled lifestyle with more dense populations.