Are There Lost Alien Civilizations in Our Past?

Summary by Krater

This video explores whether ancient industrial or hunter-gatherer alien civilizations could have existed on Earth, examining what traces they would leave in the geological and fossil records.

From the video

Answers: Could ancient alien civilizations have existed on Earth before humans?

• alien civilizations on Earth
• geological record and Anthropocene
• hunter-gatherer societies and artifacts
• agricultural and empire alien societies
• industrial civilization fossil footprints

What it concludes

• Hunter-gatherer alien civilizations would leave very few artifacts and fossils, making them virtually undetectable in the geological record.
• Agricultural and empire alien civilizations would leave more sophisticated tools, architecture, and fossils, but these would still likely vanish after millions of years.
• Industrial alien civilizations would leave massive, distinct scars on the geological record, such as altered isotope ratios, plastics, radioactive elements, and mass extinctions.
• The lack of any traces of ancient industrial civilizations in the geological record indicates that no such civilizations existed in Earth's deep past.
• Sustainable industrial civilizations might leave tiny, easily overlooked geological imprints, making them hard to detect over hundreds of millions of years.