A Comet Impact 12,900 Years Ago Destroyed an Advanced Civilisation
Randall Carlson, a geologist and frequent collaborator of Graham Hancock, combines the legitimate Younger Dryas Impact Hypothesis with the unsubstantiated claim of a destroyed advanced civilisation. The comet hypothesis is the subject of serious scientific debate; the extension of that hypothesis to a lost civilisation has no archaeological support whatsoever.
What we know
Randall Carlson, a frequent guest on the Joe Rogan podcast, argues that a massive cometary impact around 12,800 years ago triggered catastrophic global flooding and destroyed an advanced ancient civilization, a scale of catastrophe he says mainstream geology has systematically underestimated or suppressed.
There is genuine, serious scientific research behind part of this claim. The Younger Dryas impact hypothesis, proposing that fragments of a disintegrating comet struck or exploded over North America around 12,800 years ago, is an active area of study among specialist geologists and has produced peer-reviewed papers in journals including PNAS presenting evidence such as platinum anomalies, meltglass, and nanodiamonds in sediment layers from that period. The hypothesis remains contested within the geology community; multiple independent research groups have been unable to replicate some of the proposed impact markers, and a substantial body of geological literature attributes the Younger Dryas cooling event to other mechanisms, particularly a large meltwater pulse disrupting North Atlantic ocean circulation.
Where Carlson's presentation diverges sharply from the scientific hypothesis is in scale and consequence. The mainstream versions of the Younger Dryas impact hypothesis discuss regional climate disruption and megafauna extinction pressure, not global flooding on the scale Carlson describes, and none of the peer-reviewed literature on the topic claims the event destroyed an advanced global civilization. That additional claim rests on the same evidentiary gap identified in other lost-civilization theories: no tools, structures, written records, or other physical traces of an advanced civilization from that period have been found anywhere, despite over a century of global archaeological survey.
Carlson's framing of an ancient cataclysm serves as connective tissue between a genuinely contested but legitimate geological hypothesis and a much larger, evidence-free claim about a lost advanced civilization, a pattern that gives the larger claim borrowed credibility from the smaller, more defensible one. Geologists studying the Younger Dryas event have specifically pushed back on this conflation, noting that accepting evidence for a climate-disrupting impact event does not require accepting Carlson's civilizational claims, which stand entirely without independent physical evidence of their own.
Carlson frequently presents geological features such as the Channeled Scablands in Washington State as proof of catastrophic flooding on a scale far beyond what mainstream geomorphology accepts. While the Scablands were indeed carved by massive glacial lake outburst floods, a point mainstream geology has accepted since J Harlen Bretz's work was vindicated decades after he first proposed it, the accepted timeline and mechanism for those floods, repeated Ice Age glacial lake drainage events, is well constrained by geological dating and does not require or support Carlson's added claims about a lost human civilization being destroyed in the process.
Common claims
- The Younger Dryas Impact Hypothesis is confirmed and uncontested.Misleading - a legitimate hypothesis but still debated
- A comet impact destroyed an advanced civilisation.Not supported - no direct evidence exists
- Mainstream geology ignores cataclysmic evidence.False - the YDIH is actively researched in peer-reviewed literature
All sources
- The Dangers of Pseudohistorical Conspiracy TheoriesGNET Research · 2023
- Younger Dryas Impact HypothesisNational Oceanic and Atmospheric Administration Paleoclimatology Program · 2023
- Comet Research Group claims about Younger Dryas impact lack broad scientific supportScience Feedback · 2022
- Ancient Apocalypse fact checkSociety for American Archaeology · 2022