While no one knows the exact date, to the precise year,  when dairy was introduced into the human diet, it's becoming pretty clear that dairy was only introduced into the human diet in a big way in the Neolithic. At best, some dairy-advocates might claim that Palaeo hunters actively sought milk from the udders of freshly-killed female bison etc., but in order for milk to have been  regularly consumed by humans in decent quantities, one would have to work out the first date of domestication of cattle(estimated at not greater than c.9,500 years BC, and many have disputed some finds by claiming that certain very ancient skeletons from 9,000 years BC  actually came from wild, undomesticated animals), and extrapolate from that. Here's a table showing the earliest dates of domestication of the various animals, giving a figure of 8,000 years BC for cattle:-
 
http://tinyurl.com/339k3r
 
Interestingly, current scientific research seems to pinning down the date more accurately. Here's an article re a scientific report, which is amusingly pro-dairy, but at the same time indicates that all Europeans, from 5,000 to 6,000 years ago, were still lactose-intolerant.  So, absurd WAPF claims re dairy being adapted to within a short time, c.9,000 years ago, are a load of bunk.
 
http://tinyurl.com/2kkqgk
 
Anyway, my point is, simply, that there is no genuine evidence for  widespread dairy-consumption in the Palaeolithic period, only for the Neolithic. 
 
As for dairy-discussions, while I recognise that arguments in favour of Neolithic foods like dairy/grain  are probably best left to more relevant  WAPF-group-lists and related sites,   I do hope that anti-dairy articles/arguments can still be posted here - after all, Cordain and other Palaeo gurus routinely criticise dairy and its negative effect on health.
 
Geoff> > Peter Hummers suggests that discussion about> milk should not be on this list. That is open to> question as the time that humans became> regular milk drinkers (and thus kept mammals=20> for their milk) is not known. It may be that> regular milk consumption is as non-palaeo as> regular grain consumption. That's my general> position, but we just don't really know, do we.> > Keith>
_________________________________________________________________
Feel like a local wherever you go.
http://www.backofmyhand.com