"...abide"

Earth 'will' abide. In it's early history it was a hit by an object the size of Mars. We live on Earth 2.0,...this world abides. So we're no threat. Earth will just right herself. In some tens of million years, see the earth above, you'd never know we were ever here.

As for them 30 to 100 Million years.
The scars humans will leave behind, quarries tunnels city traces will be very faded.

Also the half-life of most of the radio-active materials we fooled with will have cooled off. Tho' there are some artificial exotic radiated materials we made with half-lives that border the hundred million mark.

If you were an Exo-Geologist from another star system say 60,000,000 years from now. That, and your dig was in the neighborhood of a former Laurence Livermore site. You'd be surprised, and intrigued at the radiation readings you were getting.

The source is clearly artificial, and has been in this deposit for tens of millions of years. Like the Voyager probes sailing out to the stars this find would say there was an ancient intelligent species that once lived on this world.

That at long last would be our "First Contact".

A thought on the above.

There's life out there plenty of it. However mostly microbes or at best fish folks. These happily swimming along dreaming fish poetry.

Inquisitive builder sorts like us are likely very few. Timing is our problem. We tend to miss each other by many tens of millions of years. A moment to eternity, but critical to us.

If we ever go to the stars we'll find their traces, and eventually yet others will find ours.
First Contacts will almost entirely be like this,...except for meeting them cool fish poets.

This is just as well.
You can't have space battles with fossils,...or poets.