Been saying this for years. Antediluvian civilizations probably had some magnificent buildings which have long-ago succumbed to the genuine ravishes of time.
Yep when the found the engraved symbols ACME HOMES on the wood.
I think C14 can date back about 50,000 years.
I have a theory about why such a building might be possible. We note that every 100k or slightly longer period of years, the world glides into a long chilling phase, but finally warms up for about 20k years. This cycle has been going on for around a million years. I believe during those warm periods there is a flourishing of civilization and then when the next long cold period starts the advances are mostly lost as many people die , and living gets really hard, until the next warmup such as we are in now.
I hope more scientists are encouraged to dig past the layers recognized by their peers as the bottom layer of a specific cultural period, such as they did when it was declared that there was no North American people before the Clovis period. Now they are digging deeper and discovering, Gee there really were earlier people. I also hope more searching will be done in the areas no under water that were exposed for living purposes during the long cold periods when the seas were as much as 400 feet lower than they are now.