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“An Ojibwa tradition seems relevant. It speaks of a comet that 'burned up the earth' in the remote past and that is destined to return:
'The star with the long, wide tail is going to destroy the world some day when it comes low again. That's the comet called Long-Tailed Heavenly Climbing Star. It came down here once, thousands of years ago. Just like the sun. It had radiation and burning heat in its tail ...
Indian people were here before that happened, living on the earth. But things were wrong with nature on the earth, and a lot of people had abandoned the spiritual path. The Holy Spirit warned them a long time before the comet came. Medicine men told everyone to prepare. ... The comet burnt everything to the ground. There wasn't a thing left ...
There is a prophecy that the comet will destroy the earth again. But it's a restoration. The greatest blessing this island [Turtle Island/America] will ever have. People don't listen to their spiritual guidance today. There will be signs in the sun, moon and stars when the comet comes down again.”
― Graham Hancock, America Before: The Key to Earth's Lost Civilization

“Something akin to a global scale combustion caused by perhaps a comet scraping our planet's atmosphere or a meteorite slamming into its surface, scorched the air, melted bedrock and altered the course of Earth's history. Exactly what it was is unclear, but this event jump-started what Kenneth Tankersley, an assistant professor of anthropology and geology at the University of Cincinnati, calls the last gasp of the last ice age. 'Imagine living in a time when you look outside and there are elephants walking around in Cincinnati,' Tankersley says. 'But by the time you're at the end of your years, there are no more elephants. It happens within your lifetime.”
― Brien Foerster, Aftershock: The Ancient Cataclysm That Erased Human History

“The spherules [that could only have formed from the combustion of rock] also were found at 17 other sites across four continents, an estimated 10 million metric tons' worth, further supporting the idea that whatever changed Earth did so on a massive scale. It's unlikely that a wildfire or thunderstorm would leave a geological calling card that immense, covering about 50 million square kilometers. 'We know something came close enough to Earth and it was hot enough that it melted rock, that's what these carbon spherules are. In order to create this type of evidence that we see around the world, it was big,' Tankersley says, contrasting the effects of an event so massive with the 1883 volcanic explosion on Krakatoa in Indonesia. 'When Krakatoa blew its stack, Cincinnati had no summer. Imagine winter all year round. That's just one little volcano blowing its top.”
― Brien Foerster, Aftershock: The Ancient Cataclysm That Erased Human History

“Tankersley says while the cosmic strike had an immediate and deadly effect, the long term side effects were far more devastating, similar to Krakatoa's aftermath but many times worse, thus making it unique in modern human history. In the cataclysm's wake, toxic gas poisoned the air and clouded the sky, causing temperatures to plummet. The roiling climate challenged the existence of plant and animal populations, and it produced what Tankersley has classified as 'winners' and 'losers' of the Younger Dryas. He says inhabitants of this time period had three choices: relocate to another environment where they could make a similar living; downsize or adjust their way of living to fit the current surroundings; or swiftly go extinct. 'Winners' chose one of the first two options, while 'losers,' such as the woolly mammoth, took the last.”
― Brien Foerster, Aftershock: The Ancient Cataclysm That Erased Human History

“The evidence claimed for an impact event includes a charred carbon-rich layer of soil that has been found at some 50 Clovis dated sites across the continent. The layer contains unusual materials (Nano diamonds, metallic micro spherules, carbon spherules, magnetic spherules, iridium, charcoal, soot, and fullerenes enriched in helium-3) interpreted as evidence of an impact event, at the very bottom of the black mat of organic material that marks the beginning of the Younger Dryas. The idea that Earth-based volcanism, or other natural processes, or human activity being responsible has been ruled out.”
― Brien Foerster, Aftershock: The Ancient Cataclysm That Erased Human History

“Massive wildfires occurred at the onset of the Younger Dryas, representing the most anomalous episode of biomass burning in at least 120,000 years and possibly in the past ~386,000 years.”
― Graham Hancock, America Before: The Key to Earth's Lost Civilization

“A 24,000-year sequence recorded in a marine core from the Santa Barbara Basin, off the coast of California, exhibits the highest peak in biomass burning precisely at the onset of the Younger Dryas. ... This anomalously high peak correlates with intense biomass burning documented from the nearby Channel Islands. ... The peak also coincides with the extinction of pygmy mammoths on the islands and with the beginning of an apparent 600-800-year gap in the archaeological record, suggesting a sudden collapse in island human populations.”
― Graham Hancock, America Before: The Key to Earth's Lost Civilization

“The earth and all life upon it endured and was devastated by what can only be described as a globally distributed firestorm at the onset of the Younger Dryas around 12,800 years ago. In this planetary debacle, 10 million square kilometers of trees and other plant matter burned.
To put that in perspective, the United Kingdom was in a state of traumatic shock in late June and early July 2018 after 4,942 acres of Lancashire moorland were consumed by wildfires. That's an area of just 20 square kilometers, but firefighters and emergency services from seven counties were utterly overwhelmed by the blaze and the military had to be brought in to assist.
Meanwhile, a report in the Sacramento Bee dated July 2, 2018, opined that California's wildfire season had started early, with two 'major fires' already fought at huge expense and requiring evacuation of local residents. These two fires were estimated to have consumed 85,000 acres, which sounds an awful lot but in fact converts to just 344 square kilometers.
The previous years, 2017, was California's most destructive wildfire season then on record, with a total of 1.25 million acres burned. The cost of dealing with the disaster, including fire suppression, insurance, and recovery expenditures, was estimated at US$180 billion. Yet 1.38 million acres converts to just 5,585 square kilometers--an insignificant fraction (around 0.05 percent--that is, a twentieth of 1 percent) of the 10 million square kilometers destroyed in the Younger Dryas wildfires.”
― Graham Hancock, America Before: The Key to Earth's Lost Civilization

“In the case of the Younger Dryas, the jeopardy that humanity faced was not from nuclear missiles but from the incoming fragments of a disintegrating giant comet, traveling at tens of kilometers per second, with the larger fragments as deadly as hundreds of nuclear warheads. Indeed, it is estimated that the total explosive power of the comet fragments that struck the earth in repeated episodes over a period of 21 years some 12,800 years ago would have been of the order of 10 million megatons--1,000 times greater than all the nuclear devices stockpiled in the world today.”
― Graham Hancock, America Before: The Key to Earth's Lost Civilization

“What we are looking for [...] is an agent capable--simultaneously and almost instantaneously--of bringing about all of the following:

-a global flood
-wildfires across an area of 10 million km2
-6 months of icy darkness followed by more than 1,000 years of glacially cold weather
-a stratum of soil across more than 50 million km2 dated to the Younger Dryas Boundary (YDB) and infused with a cocktail of nanodiamonds, high-temperature iron-rich spherules, glassy silica-rich spherules, meltglass, platinum, iridium, osmium, and other exotic materials
-a mass extinction of megafauna

Wolfbach and her coauthors are forthright in their conclusion: 'Multiple lines of ice-core evidence appear synchronous, and this synchroneity of multiple events makes the YD interval one of the most unusual climate episodes in the entire Quaternary record. ... A cosmic impact is the only known event capable of simultaneously producing the collective evidence.”
― Graham Hancock, America Before: The Key to Earth's Lost Civilization

“SHERIDEN CAVE, OHIO: There are [Younger Dryas Boundary] peaks in magnetic spherules, meltglass, nanodiamonds, Pt, and Ir. A charcoal-rich black mat dates to the [Younger Dryas] onset and contains peak abundances of charcoal, AC/soot, carbon spherules, and nanodiamonds that are closely associated with the last known Clovis artifacts in the cave. The black-mat layer is in direct contact with the wildfire-charred bones of two mega-mammals, the flat-headed peccary (Platygonus compressus) and the giant beaver (Castoroidies ohioensis), that are the last known examples anywhere in the world of those extinct species.”
― Graham Hancock, America Before: The Key to Earth's Lost Civilization