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"If an industrial civilization had existed on Earth many millions of years prior to our own era, what traces would it have left and would they be detectable today?"

Proposed: that it is possible that at least once an ancient civilization millions of years ago existed. See: The Silurian Hypothesis

"...for all the dinosaurs that ever lived, there are only a few thousand near-complete specimens, or equivalently only a handful of individual animals across thousands of taxa per 100,000 years. Given the rate of new discovery of taxa of this age, it is clear that species as short-lived as Homo sapiens (so far) might not be represented in the existing fossil record at all. The likelihood of objects surviving and being discovered is similarly unlikely...the current area of urbanization is <1% of the Earth's sections and drilling sites for pre-Quaternary surfaces are orders of magnitude less as fractions of the original surface. Note that even for early human technology, complex objects are very rarely found. For instance, the Antikythera Mechanism (ca. 205 BCE) is a unique object until the Renaissance. Despite impressive recent gains in the ability to detect the wider impacts of civilization on landscapes and ecosystems (Kidwell, 2015), we conclude that for potential civilizations older than about 4 Ma, the chances of finding direct evidence of their existence via objects or fossilized examples of their population is small."

Read the hypothesis for details on comparisons of geological events that have similarities to current human impacts on the planet, including increased CO2 production, oceanic anoxia, etc. What is found is that yes, there is evidence in the geological record that planetary changes SIMILAR to those of the current Anthropocene signature exist. It has been assumed those were natural in nature. What if some of them were not?

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Subject Views Written By Posted
The Silurian Hypothesis 1138 Race Jackson 16-Apr-18 20:11
Did an extinct civilisation pre-date mankind on Earth 181 M. J. Thomas 17-Apr-18 23:27
Mod Note > Duplicate Topic Merged 172 Dr. Troglodyte 18-Apr-18 00:12
Re: Wrong Link 132 M. J. Thomas 18-Apr-18 15:45
Re: The Silurian Hypothesis 180 Archaic 18-Apr-18 21:26
Re: The Silurian Hypothesis 193 Aine 20-Apr-18 14:54
Re: The Silurian Hypothesis 154 Susan Doris 21-Apr-18 05:45
Re: The Silurian Hypothesis 147 Aine 21-Apr-18 12:03
The Pronghorn 150 Archaic 21-Apr-18 13:26
Millions of years 188 Race Jackson 22-Apr-18 17:27
The Silurian Hypothesis 139 SteveSmith 01-Jul-18 00:41
Mod Note > Duplicate Topic Merged 165 Dr. Troglodyte 01-Jul-18 12:18

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