There's sufficient evidence that there was a civilization that was evolving and an advanced civilization that was here.
To my knowledge no one disputes this general statement. Your “advanced civilization” is just those civilizations which left us records of their existence.
Although, no one can explain it
Unfortunately, we can’t go back in time to ‘explain’ anything. We can only describe the evidences they left us.
There's also evidence of a new civilization approximately 6000 years ago.
Not a new civilization, just an evolving civilization. You are talking about the much discussed Neolithic revolution.
Instead of seeing the obvious, we all disagree because, if we do decide to agree on this, all sides are admitting that they are wrong about how they believe...
We are egotistical beings, each of us wants to be right! This is just something, IMO, we have to get used to.
Edited 1 time(s). Last edit at 22-Aug-19 22:53 by Eddie Larry.