Back in 2016, Graham Hancock released an article on his website called “Göbekli Tepe Image on Sumerian Tablet?”, which I've linked below.
In the article, it states that Hancock was contacted by an independent researcher called Madeleine Daines who was working through the Cuneiform Digital Library when she came across a Sumerian tablet from 3,500 BC, which means it was made between 4 and 5,000 years after Göbekli Tepe was abandoned and the T-shaped pillars covered over.
According to Daines, the tablet is apparently showing us a depiction of a Göbekli Tepe circular enclosure with two T-shaped megalithic pillars and Hancock asks whether this could mean that sites with similar architecture to Gobekli Tepe could have remained in operation long after the pre-pottery Neolithic. He also asks if these structures could have still been revered by the Sumerians thousands of years later.
So is it possible? Is there a depiction of a Pre-Pottery Neolithic circular enclosure on a Sumerian tablet? Watch the video to find out!
The information in this video is obtained firstly from Graham Hancock's website and also the Tepe Telegrams blog - a post by Oliver Deitrich. I agree with Oliver's explanation and alsthough I have read the response by Daines to Deitrich, I still believe that we are looking at Gobekli Tepe pillars on a Sumerian cylinder seal to be an enormous stretch. But that is just my opinion and each to their own.
All images are taken from Google Images and the below sources for educational purposes only.