I found these ...


Agricultural origins: the evidence of modern and ancient DNA
Jones M.1; Brown T.2
The Holocene, Volume 10, Number 6, 1 November 2000, pp. 769-776(8)

Abstract:

The appearance of agriculture is one of the most striking features of Holocene human history, a feature that has long been studied in an interdisciplinary fashion, bringing archaeology together with plant and animal genetics. This paper reviews new developments in that study, consequent upon recent advances in DNA science. Among these advances is the possibility of complementing modern DNA data with fragmentary evidence of ancient DNA. Following a short account of the historical foundations of this research, studies of plant and animal domesticates based upon variations in protein, modern DNA and ancient DNA are reviewed in turn. The results of these studies are considered against a background of two contrasting models of how agriculture originated and spread, characterized by Blumler (1992) as ‘stimulus-diffusion’ and ‘independent invention’. We argue that existing evidence from DNA supports neither model in its extreme form, favouring instead an intermediate model.


and


Was Agriculture Impossible during the Pleistocene but Mandatory during the Holocene? A Climate Change Hypothesis
Peter J. Richerson, Robert Boyd, Robert L. Bettinger
American Antiquity, Vol. 66, No. 3 (Jul., 2001) , pp. 387-411

Abstract:

Several independent trajectories of subsistence intensification, often leading to agriculture, began during the Holocene. No plant-rich intensifications are known from the Pleistocene, even from the late Pleistocene when human populations were otherwise quite sophisticated. Recent data from ice and ocean-core climate proxies show that last glacial climates were extremely hostile to agriculture-dry, low in atmospheric CO2 and extremely variable on quite short time scales. We hypothesize that agriculture was impossible under last-glacial conditions. The quite abrupt final amelioration of the climate was followed immediately by the beginnings of plant-intensive resource-use strategies in some areas, although the turn to plants was much later elsewhere. Almost all trajectories of subsistence intensification in the Holocene are progressive, and eventually agriculture became the dominant strategy in all but marginal environments. We hypothesize that, in the Holocene, agriculture was, in the long run, compulsory. We use a mathematical analysis to argue that the rate-limiting process for intensification trajectories must generally be the rate of innovation of subsistence technology or subsistence-related social organization. At the observed rates of innovation, population growth will always be rapid enough to sustain a high level of population pressure. Several processes appear to retard rates of cultural evolution below the maxima we observe in the most favorable cases.

(I had to type this out so any errors are mine)

I have the pdfs if anyone wants them.

Kat

Ma'at Moderator

Founder and Director of The Hall of Ma'at

Contributing author to Archaeological Fantasies:
How pseudoarchaeology misrepresents the past and misleads the public
"If you panic, you're lost" -- W. T. 'Watertight' Southard



Edited 1 time(s). Last edit at 06/20/2006 07:41PM by Katherine Reece.