Glasware last forever. I expect that a lot of bottoms of https://en.wikipedia.org/wiki/Soda_siphon survive in landfills.

Gold jewelry, but I'm not sure it can prove industrialization.

The asphalt of the roads may dissapear, but the gravel mixed with it and under it will create a very strange pattern.

Panama and Suez channels, unless they are very unluck and get destroyed.

Kitchen granite top and tumbstones. Marble may disolve if there is and acid environment.

Quarries and coal mines are huge.

> glassware last forever

Million years [1]. (It devitrifies.)

> asphalt of the roads may dissapear, but the gravel mixed with it and under it will create a very strange pattern

Would this be recognisable at an industrial scale?

> Panama and Suez channels

Suez is right above the East African rift, so maybe 10 My. Panama no clue.

> Quarries and coal mines are huge

To where they could evidence industrial activity after millions of years?

[1] https://education.seattlepi.com/long-glass-bottle-degrade-la...

>> glassware last forever

> Million years. (It devitrifies.)

Very interesting. It's difficult to get hard numbers. It depends a lot on the composition and the temperature, so I'm more optimistic about they lasting for a few millons years at burried at 15°C(60°F), but I agree they don't last forever

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>> asphalt of the roads may dissapear, but the gravel mixed with it and under it will create a very strange pattern

> Would this be recognisable at an industrial scale?

I guess so. We have a lot of roads with a not random patterns.

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>> Panama and Suez channels

> Suez is right above the East African rift, so maybe 10 My. Panama no clue.

I agree. Both are in bad positions to last forever.

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>> Quarries and coal mines are huge

> To where they could evidence industrial activity after millions of years?

I guess they are. Look at this video https://www.youtube.com/watch?v=fjp6RHb7MtE the truck are huge, from time to time there appears a normal truck next to them and it looks like a toy truck. I think when abandonded they get filled with water, then with mud and decomposing plants, and then that will solidify and in the future they will have a huge "volvano caldera" but no volcano at the bottom. Also find the internal roads, cuts by explossions and other strange characterisitcs. The truck will have rot a long time ago and dissapeared, but they may find unusual levels of iron contamination in the parking lot.

There's these tiny little chips of silicon ... easy to miss, real microliths.

I'm not sure how concrete fares with time, but we're making a lot of it. If buried asphalt roads might present a decent head-scratcher. And if not weathered rock carvings should be noticable for a long time.

Concrete is laid on recognizable shapes that would never be present in nature - and while it would lose strength and degrade in time, the underlying minerals would still be present and clearly recognizable.

Same with steel, stainless steel, brass, ceramics (of all types), glass, plastic, etc.

Hell, just all the roadside glass bottles over the years will leave one difficult to ignore trail.

While I agree with most points: steel degrades quickly. Iron-age swords found are in a bad shape already (bronze age swords preserve better!). Stainless is better, but not that better.

And iron oxide girder shapes are going to be pretty hard to blame on something else eh?

Iron oxide is super stable. Chromium oxide too.

I’m not saying they’ll not oxidize, I’m saying they’ll still form very recognizable, unnatural, and stable shapes when they do. Even a fully oxidized iron sword leaves a sword shaped lump where it is.

And that isn’t something that occurs very often in nature.

Not a rock, but how about carbon cenospheres? https://news.ycombinator.com/item?id=16837470