[SunkenCiv]

I suspect that non-visible spectra would turn up faded human works in caves throughout the world.

A Shocking Find in a Neanderthal Cave in France ( inhabited 176,000 years ago )
The Atlantic | May 25, 2016 | Ed Yong
Posted on 9/29/2020, 6:54:54 PM by Candor7
https://freerepublic.com/focus/chat/3888953/posts

[Bob Ireland]

***A Shocking Find in a Neanderthal Cave in France ( inhabited 176,000 years ago )
He eventually dug out a tight, thirty-meter-long passage that the thinnest members of the local caving club could squeeze through. They found themselves in a large, roomy corridor. There were animal bones and signs of bear activity, but nothing recent ***

Now, I admit to likely being an aging simpleton, but if the thinnest spelunker had to squeeze with difficulty through a narrow 90+ foot 'cave' (crevice), what sort of bear activity should we expect? Could they have been teddy bears?

Some 336 meters into the cave, the caver stumbled across something extraordinary—a vast chamber where several stalagmites had been deliberately broken. Most of the 400 pieces had been arranged into two rings—a large one between 4 and 7 metres across, and a smaller one just 2 metres wide. Others had been propped up against these donuts. Yet others had been stacked into four piles. Traces of fire were everywhere, and there was a mass of burnt bones

The article implies that this was unlikely the work of bears - which seems reasonable, although we lack serious historical records of teddy bear activities.