It appears to be cooled Pyroclastic flow. Lava weathers very slowly compared to everything around it.
But what I was getting to was that your statement implies that it is a boat and that it did float at some point. So seeing how it is not a boat when water was there last is irrelevant.
Butfrom what I have read it about the geology it was formed under water millions of years ago.
We do not know that to be the case. According to his report, scans elude to it being a boat structure. No digging has begun. No I wasn't implying that it is a boat. In fact, I started with that the Ark, #3, has not been proven and remains that way, but that it looks promising. Perhaps I should have stated why it looks promising, because of scans etc. Sometimes we all take short cuts thinking our comments, in my case implying that it is not proven at all, as being sufficient so as to not get verbose, or just to be lazy. 🤣
I further said that if it is proven, there will be people who will deny it, and then added; how will they explain it being there.
That picture is grainy, and thus gives the appearance of being a lava flow, however, if you look at this picture, one gets a vastly different impression of the landscape in question. The other picture, in my opinion, is the lidar scan image.
Here is that other picture taken from Wikipedia:
Lidar scan image? That impression at the bottom of the image sure looks like a boat to me: