"The cleaned straw was saved for fuel, thatching, and weaving into baskets to hold the new grain. A well drained area on a hill or rise would have been preferable for this work. The fact that there is no evidence of ceremonial fire or hearth in most stone circles is understandable when viewed in the light that the circles might have been granaries. The outlying ditch would have been of value as a firebreak. Protecting the valuable grain would have been of the utmost importance to these early farmers."
I would expect to find some heath evidence on site for making the wheat into bread and possibly some storage pits to keep the grains in.
Also the powder from wheat is extremely flammable having stacks of straw on site would cause major fire risks, plus the powder would blow away quite easily as it on a windswept hill.
Apologies for ripping this to bits but any archeologist would do the same - hopefully you can bolster your thesis by looking into this.