Well, gee, fellas… I suppose this is going to be moved to GD fairly quickly. 
OK, one at a time:
lemur866, of course all modern hunter-gatherer societies know about the connection. As I pointed out in my post, the American Plains Indians knew about it, too. The point is that modern societies do not live in isolation. This particular fact, once known, spreads quickly through all societies that have contact with each other. Someone had to realize it first and, in pre-history, they didn’t have CNN so news traveled very slowly.
And I did not state that all hunter-gatherer societies are matriarchal. Quite specifically, I mentioned the Plains Indians. I said that societies that do not realize the connection are matriarchal and that, once the knowledge is there, they become patriarchal. Presumably, modern hunter-gatherers picked up the knowledge in ways other than someone sitting down and thinking it through.
And, by the way, I can’t see this as neo-feminism or neo- anything…as I learned it in college some 40 years ago. And, with respect, lemur866, (in spite of the “woolly-headed” comment), may I suggest that your quick, rather heated response is saying something about your feelings regarding this, rather than your thoughts?
smiling bandit, of course there are no written records regarding this transformation as writing was one of the other things brought on by agriculture and settled civilisation and, therefore, the cultural transformation pre-dated it. What the earliest Sumerian and Egyptian writings do show is a heavy emphasis, a preoccupation with the mightiness of male kings and their procreative power…while the earlier oral traditions survived quietly in the rites and private worship of women which were first recorded by the Greeks and Romans in the Classical Period, where they were regarded as the ancient predecessors of the contemporary male-oriented rites.
SuaSponte, as I’ve never read the Clan of the Cave Bear novels, nor seen the movie, I have no clue which side you’re supporting; you’ll have to clarify for me.
Now…is all this proof? No. Is it theorizing? Yes. Is it “woolly-headed?” I don’t think so. And I can’t see male, apparently knee-jerk reactions that it’s wrong, wrong, wrong as an valid indictment.
I note that no one has come up with an alternative theory more persuasive than the OP’s “Who the heck knows?” So suggest something else, support it, and I’ll happily go with Occam’s Razor.
I’ll spend the rest of the evening, while also doing other things online, searching for reputable (non-feminist, for you defensive types) online citations.
And, for the record, I am male, happily male, absolutely adored being in the front ranks of the Sexual Revolution of the 70’s and 80’s (which I came through with many scratches but otherwise unscathed), and am now very happily married. 