Re: Agriculture began 23,000 years ago
Posted: August 9th, 2015, 3:06 pmi think records are one thing forensics another and reasonable assumption - not very scientific but certain things can be assumed like a lack of dental etc
Forest_Dump » Fri Aug 07, 2015 8:30 pm wrote:I thought the article was actually pretty good and interesting but I think a few points should probably be brought up. First it can be extremely difficult to distinguish domesticated plants from their wild ancestors given that people at the time had little or no knowledge or experience with the kind of long range planning over hundreds or thousands of years necessary. Its pretty safe to say that we can't be sure whether they were deliberately planting or simply harvesting from patches of wild wheat, etc. Only a very detailed analysis of the preserved seeds can answer the question of whether they show convincing evidence of being seeds with a stronger richis, etc., because that would indicate seeds that would not propagate naturally in that they would not fall off the stem easily which would make them easier to be harvested and stored for seed crop. The article also mentioned harvesting and processing tools but again the same tools were used for harvesting wild plant food. A little more interesting is the reference to weeds that grow on disturbed ground. The authors note that these would grow on fields but they would also colonise the ground disturbed around a settlement from simple trampling of the ground. An interesting example of parallel reasoning was actually an hypothesis forwarded by David Rindos regarding weeds colonising semi-sedentary camps in eastern North America where these weeds would produce edible seeds and over preferential picking of these local weed seeds andf perhaps increasingly tending these in proto-gardens over some centuries, several types of plants ultimately domesticated (e.g. goosefoot, amaranth, sunflowers and perhaps tobacco). While I would not doubt there were a number of early experiments in horticulture and gardening that ultimately failed for any number of reasons I am always cautious about these kinds of claims that would push the date of domestication so far back in time. If there was enough success in gardening to warrant any kind of change in lifestyle such as putting in the work to till fields in any significant way, reschedule other resource procurement, etc., that could take generations to achieve and for people to put much trust in kind of investment. Therefore I would expect that when there was any kind of appreciable success in gardening, even if it was only a small addition to the diet, it would have spread around and we would be seeing similar kinds fo evidence at other sites dating close to the same time. When and where horticulture and domesticated plants appear it does seem to spread around reasonably quickly because it was of some value and I doubt many people couold have kept that kind of secret for more than a century to two (historically, even the strongest kingdoms could only keep monopolies like that for a few decades).
Getting back to the thrust of the Opening Post that suggested we may have to push back the dating of first trials of agriculture by maybe 11,000 years, I was impressed by Forrest_Dump’s contribution in which he questioned some of the conclusions. I managed to locate the original article on which this thread was based. The full text is available free on http://www.ncbi.nlm.nih.gov/pubmed/26200895 and the conclusions quite clear, but questionable, and the authors admit this to some extent.
Conclusions
We suggest that the Ohalo II archaeobotanical remains indicate that the locals practiced small-scale cultivation, with no evidence for its continuation in the following period. Similar failed trials with new techniques are known from the history of technology but the ideas remain within the generally same population [62]. There are several lines of evidence supporting this suggestion: (i) The large numbers of edible grasses, wild wheat, wild barley and wild oat; (ii) The large numbers of proto-weeds; (iii) The common presence of domestic-type disarticulation scars, far beyond the normal representation in wild populations, and (iv) The presence of the earliest sickle blades, indicating planned cereal harvesting. Indeed, it is important to note that we do not claim a domesticated status for the Ohalo II wheat and barley. We assume that such trial cultivation could be the reason for the significant representation of domestic-type rachises. In turn, the domestic-type rachis is probably an indication of some evolutionary change, similar to the process that took place some ten millennia or so later, when wheat and barley became fully domesticated. However, these changes likely disappeared after the short Ohalo II cultivation endeavor, although archaeobotanical data (and sickle blades) are still lacking from the immediately succeeding sites
I believe everyone associated with this site assumes that it was a relatively short-lived settlement and that the carbon-dating of its brief existence (because of flooding following the Ice Age) was accurate enough to be c 23000 years ago.
Re Conclusion i, I would have expected less than 13 species of edible grasses amongst the final accumulation if the inhabitants had observed even 10 years of experimental planning.
Re Conclusion ii, read Forest_Dump’s contribution above. I would add to that my own personal experience of witnessing horses turn paddocks with prime pasture into paddocks of weeds by selectively eating the best grasses. My suggestion is that hunter-gatherers with preferential sickle-harvesting of wild cereal-type grasses would achieve the same effect as horses in nearby fields. Only the weeds survive.
Re Conclusion iii, I know nothing about disarticulation scars and so prefer not to comment.
Re Conclusion iv, I’m with Forest_Dump that the same tools would be used for the harvesting of wild cereal grasses as for cultivated crops. I would also like to add a probability that these people had the same size brain as ourselves and would therefore be just as intelligent. And on this basis I would like to ask why they would bother to attempt to plant and grow cereal grasses, when they were growing in abundance over hundreds of square kilometres naturally (my imagination and guessing at the latter). If you read the original article, you will see that they found far more seeds of much smaller size grass variety than they did of what we regard as large cereal types; I find it hard to believe that they would collect anything and everything if they'd successfully cultivated larger seeds.
I apologise, but I’m just not convinced by this article that we can yet push the development of agriculture back another 8000 or 11000 years. Obviously it does indicate intimate contact with edible seeds as a precursor to the development of planting and harvesting - hence agriculture.