There are other structures that seem to have been built by hunter-gatherers. Stonehenge comes to mind. The construction dates of Stonehenge aligns with the absolute dates of civilizations elsewhere in the world, but in the British isles it was still a time of hunter gatherers.
There is also much archaeological evidence for large, permanent "meeting point" structures built with wood columns and dirt fortifications. What makes Gobekli Tepe interesting is that it is stone (albeit a very soft stone that didn't need complex tools to work with) and therefore we have more than just holes in the ground and oddly shaped hills to look at.
http://www.bbc.com/news/uk-england-wiltshire-34156673
And Stonehenge is far from being the only examplar of its kind. There's a big one in Scotland:
https://en.wikipedia.org/wiki/Callanish_Stones
And another in Brittany:
https://en.wikipedia.org/wiki/Carnac_stones
It seems like back in the Neolithic, there must have some kind of pan-euroasian craze for menhir based construction.
Gobleki Tepeh predates known agriculture and permanent settlements. It really is a singular site, with genuine mystery.
Wooly Mammoths went extinct 4500 years ago.
Ref: https://persquaremile.com/2011/08/17/hunter-gatherer-populat...
I don't think you'd need 10,000 people to construct a structure like Stonehenge, especially when you consider that these were built over vast intervals of time (hundreds of years per structure, thousands for the entire site).
Archaeologists were able to use this technique at pompei, to learn exactly how vines & vineyard fenceposts were placed in ancient vineyards.
When I was in Chengdu I visited Jinsha, which has lots of evidence of postholes: https://en.wikipedia.org/wiki/Jinsha_(archaeological_site) http://www.kaogu.cn/en/Chinese%20Archaeology/3/Discovery%20a... Granted, that's only 3000 years old.
A better example (which I just learned about-- I'm literally trying to google for the oldest post holes found :) ) is Monte Verde: https://en.wikipedia.org/wiki/Monte_Verde
> Radiocarbon dating of bones and charcoal in 1982 gave the site an average age of 14,800 years ago (calibrated), more than 1000 years earlier than the oldest-known site of human habitation in the Americas at that time.[2][8][9]
> In the initial excavation, two large hearths were found and many small ones as well. The remains of local animals were found, in addition to wooden posts from approximately twelve huts.
1. The site well pre-dates current archeological evidence for sustained agriculture.
2. The site clearly supported a lot of people with similar aims and (most likely) religious significance.
3. The site is quite impressive to build on both a physical and organizational level.
The question I've heard posed around the site is: did the social/religious element help bootstrap sustained agriculture, or did the agriculture allow the gathering to form when it couldn't be sustained before, or did they form in unison? I don't think the archeological record is anywhere near answering that question; I don't recall much evidence of agriculture, and the only other model of clearly pre-agriculture society we have is H&G societies.
Long-winded; apologies. But I think we can have a more nuanced discussion than H&G vs Settled.
"To Schmidt and others, these new findings suggest a novel theory of civilization. Scholars have long believed that only after people learned to farm and live in settled communities did they have the time, organization and resources to construct temples and support complicated social structures. But Schmidt argues it was the other way around: the extensive, coordinated effort to build the monoliths literally laid the groundwork for the development of complex societies."
I don't know about quarrying stone, though.