I'm not sure that these criteria are readily measurable, and in any case it was you who introduced size of tomb as a proxy for this. I have stated my objection."Detail" & "Logistic Difficulty"...made the first ruins "more advanced."
People can lose skills or population sizes in a particular area.ALSO, remains of the following generations, show that the population 'shrank'... They "devolved" into hunter gatherers.
Wheels disappeared from Mesopotamia for millennia, after being used there at a very early date. Wheeled vehicles were displaced by pack camels. In many areas of Europe, populations were smaller in 1700 than in 1300. But what are you arguing? That humanity possessed an advanced technology, which it then lost on account of a universal catastrophe, and thus humanity as a whole subsequently turned to hunting and gathering? Are you saying this? - if so I will argue against it.
Or are you stating something else. If so, what is the proposition that you want me to accept, or at least consider?
So what? Individual populations and individual cultures can regress or even disappear. What conclusions about the general course of human progress do you think I should draw from this GT example, even assuming that your beliefs about it are well founded?The oldest ruins at GT indicate a bigger population and more advanced building techniques, than those that followed. The first ruins are dated to the younger dryas catastrophe.