Comment by T-A

> How long to dissolve carved stone sculptures (in sizes ranging from 1cm to 100m?)

A quick search on "rock weathering depth per century" suggests a "typical range" of 0.05 mm to 6 mm, depending on rock type and environmental factors. At 0.05 mm, a stone object with radius 0.5 cm would crumble in 10000 years. With radius 50 m, it would take 100 million years.

I would expect them to be unrecognizable long before that though.

> And how long does it take to dissolve skin? Footprints? Because we have those from hundreds of millions of years ago.

What do those findings tell you about the cognitive abilities and social organization of the creatures who left them behind?