Don't get me started Myke, shop talks always dull (edit: i just re-read my response and deleted a bunch, got to talking)
An archaeological time frame is often much wider I'm afraid, without contextual or some other exacting evidence. Interaction is a tricky thing to trace as is trade before the written word especially (and I think after it also!)
At some points plants can be traced by there genetic variants and it seems at a certain point a well domesticated set of "founder crops" as one author calls them and others have followed, set out from somewhere in this region of the fertile crescent out in all directions (and then towards Europe,) but it is perilously difficult to say which area within that area "started first."
Trade and contact (direct of indirect) is common and no culture has ever existed in a vaccum as a friend of mine liked to say. But which groups linked with which and who traded what - and for what - is awkward to think cement in, we do know that wheat (the founder crop of all founder crops) came from this region, and spread outwards. Sumer also being a likely first "civilization" based on crop cultivation (although where they came form and if they concord, killed or breed with the people who were there to begin with is another uncertainty! whcih does matter a little because they may have brought crop cultivation with them, rather then found it there.)
Cultural exchange happens in a number of ways ( as we describe them) but new ways of life don't just diffuse (or acculturate!) over for the sake of it or because of contact. There has to be pressure and satisfaction, in other words, it has to be acceptable to the culture, and needed by the society. (many many different view points on this one BTW.)
A popular idea at the moment is that environmental pressure (like a climate change) led to large scale adoption of crop cultivation of hunting and gathering world wide so those who were doing it developed it and those that could followed suit, those that couldn't died out or eked out a very dwindling life in a world full of societies growing in population along with their crop cultivation efforts. But then again a number of groups were in contact with crop cultivators, and traded with them, and yet never took it up (again some say they hadn't the environment to!) but many don't like the idea of a "beginning" since you don't just walk out into a field one day and have at it, it takes time for technological development, understanding, and observation - it's process of many 100's if not 100's of years before we find people doing it in earnest, not a date on a calendar, they say.
Yes exchange takes time, sometimes it doesn't though (like the
Cherokee syllabary that was basically invented and adopted producing 100% literacy over night after contact with Europeans who used writing), and is often rejected like japans initial acceptance then rejection of guns as a new technology. Receptivity creates it's own problem (which another author recently suggested we solve by saying "it's just fucking random, okay" essentially he did anyway)
Why the disclaimer? because the world, as much as it might feel different, if very under explored in terms of archaeology, (try organizing a dig in turkey, or Iran for that matter.) Egyptian writing was always thought to have come after that found in areas like Sumer, because it happened so quickly and was newer, but then more recent discoveries seem to pre-date those in the fertile crescent,
clovis artifacts seem to be the most definite date of human occupation in the Americas, and yet it seems every year
more evidence show up to disprove that pushing us further and further away from the time frame of a ice passage form one continent to another and towards...some other explanation for how we got here.
About the only thing for certain is that we know about 5% of the story we keep having to adjust and re-invent to fit it all. It''s kind fun,
And yes i know I rambled too much there and probably didn't answer the question very well, but my main interest is in stories and how we tell them to each other so....
it is a good question though
