I have been generally dismissive of most super early dates. Most have been in sediments or coal of some sort subject to compression. Our understanding of that environment is at least suspect and subject to serious revision. Material can also become plastic and engulf much harder objects as well.
Yet every out of place item raises those same questions.
To start with, time travel will turn out to be both viable and essentially safe with a minimum of care. That does make far past expeditions completely viable and even attractive. After all if a disturbance is detected it is a matter of simply patching a page past the initiating event to force it to die out.
Note i use the concept of page here. Perfect continuity as per mathematical continuity fails us. This allows all this.
Then do recall that the Earth itself has been deliberately terraformed by the Moon arriving back four billions of years in order to remove about half the earths crustal layer. I suspect it also effected later adjustments as well. If that is now we all started then of course we have been at work back there as well.
The Evidence for Time Travel