[westurner]

Does LIDAR work underwater?

FWIU in Grand Traverse Bay, Lake Michigan, there's a 9,000 year old stonehenge-like structure 40 feet underwater; that's 4000 thousand years older than Stonehenge and about 6000 years older than the Osireoin and the Pyramids.

/? Michigan underwater stonehenge: https://www.google.com/search?q=michigan+underwater+stonehen...

There's not even a name or a wikipedia page for the site? There are various presumed Clovis sites which are now underwater in TN, as well.

[Antipode]

A lot of the pictures used in articles for this are pictures of something else (possible an old ship). Here's what it actually looks like: https://holleyarchaeology.com/index.php/the-truth-about-the-...

Calling it Stonehenge-like is a real stretch.

[westurner]

That's a better source than what I found;

> The site in Grand Traverse Bay is best described as a long line of stones which is over a mile in length.

> [...] may be a prehistoric drive line for herding caribou

Also speculation that the Sage Wall in Montana is simply a geologic formation.

[thfuran]

Bathymetric lidar exists, but it's a lot more common for there to be enough particulates in water to mess it up than for air.