The Clovis People, named after the Clovis archaeological site in New Mexico were generally accepted as the earliest identifiable human population in the Americas. It was thought that they arrived on that continent around 9,000 BC. Now, however, at a site at Buttermilk Creek in Texas(a), archaeologists have found stone tools in thick sediments beneath what is accepted as typical Clovis material. It is believed that these artifacts may be as much as 15,500 years old, once again pushing back the date of the earliest Americans.
The Gault site, also in Texas, has also produced tools and some human remains that have been dated to up to 16,700 years ago, which further argues against the Clovis People as the earliest Americans. This was reinforced by the discovery of a 22,000-year-old mastodon skull along with a flaked blade made of volcanic rock.(f)
*October 2018 brought claims by researchers from the Texas A & M University that the oldest weapons ever found in North America had been discovered at another Texan location named the Debra L. Friedkin site(j). They have dated the artefacts as 15,500 years old.*
The ‘received wisdom’ regarding the origins of the Clovis people was that they had crossed into the Americas from Asia via a landbridge that spanned the Bering Strait 12,000 years ago. This has been challenged in a book by two archaeologists, Dennis J. Stanford and Bruce A. Bradley, who claim “that the first Americans crossed the Atlantic by boat and arrived earlier than previously thought. Supplying archaeological and oceanographic evidence to support this assertion, the book dismantles the old paradigm while persuasively linking Clovis technology with the culture of the Solutrean people who occupied France and Spain more than 20,000 years ago.”
Stephen Oppenheimer as added his support to this idea of prehistoric transatlantic travel during the last Ice Age, using studies that identified the genetic haplogroup 2Xa among indigenous people in northeast America and western Europe. This was outlined in a recent CBC documentary Ice Bridge, featuring Stanford, Bradley and Oppenheimer. However, for balance, a critique of the show should also be read(i).
A further sceptical view of their work should also be considered(g). However, in 2016 the Solutrean Hypothesis appears has been contradicted by genetic studies(h).
Until 1999, the existence of pre-Clovis populations was denied by mainstream archaeology(b). Today, there is almost universal acceptance of these very early settlers in both North and South America(c).
Heather Pringle has written a revelatory article about the Canadian archaeologist Jacques Cinq-Mars who has fought the establishment view since 1979 and only now has his claim of pre-Clovis hunters in North America 24,000 years ago been vindicated(e).
Nevertheless, Professors Jennifer Raff and Deborah Bolnick co-authored a paper offering evidence(d) that the genetic data only supports a migration from Siberia to America.
It seems clear to me that the debates surrounding the earliest Americans have a long way to run yet.
See Also: Younger Dryas
Younger Dryas also known as Dryas III was a mini Ice Age that lasted from around 10,700 BC until around 9600 BC. It is named after a flower that flourished during this relatively short period. In Ireland the period is known as the Nahanagan Stadial and in Britain as the Loch Lomond Stadial. For about thirteen hundred years the glaciers had been slowly retreating until within a short time-span temperatures dropped and they began to advance again. The cause of this cooling is not absolutely clear. One view is that a sudden release into the North Atlantic of vast quantities of fresh water that had been contained by huge ice dams is assumed to have closed down the Gulf Stream, resulting in a twelve hundred year lowering of global temperatures. There is evidence that the change only took one or two decades. The same threat is said to exist today with the possibility of the melting of the Greenland ice cap.
The most recent theory, by Firestone, West and Warwick-Smith, links the onset of the Younger Dryas with the explosion of a comet over North America that led to the extinction of many species, the collapse of the Clovis culture(a)(b) as well as the creation of the Carolina Bays.
A 2014 paper(g) entitled Nanodiamond-Rich Layer Across Three Continents Consistent with Major Cosmic Impact at 12,800 Cal BP by Charles R. Kinzie et al., has developed further the idea of this event being associated with the Younger Dryas. In a similar vein is an article(h) from Megan Gannon.
A recent application of archaeoastronomy by Martin Sweatman and Dimitrios Tsikritsis led them to conclude that the carved symbols at Göbekli Tepe recorded an encounter involving the explosion or impact of part of Encke’s Comet around 13,000 years ago, which triggered the Younger Dryas Event that provided the impetus for the Neolithic Revolution. Sweatman later expanded their work in his book Prehistory Decoded  and in an article on the Ancient Origins website(m).
Kevin A. & Patrick J. Casey maintain that a globally catastrophic event occurred 13,000 years ago(l). The kernel of their theory is that originally the Earth had two moons that at some later point collided, producing our current Moon, while the remnant of the second one eventually exploded over North America kick-starting what we refer to as the cooler Younger Dryas period. They are adamant that it was not a comet or asteroid that caused the devastation, and so clash with the work of Richard Firestone and his colleagues.
In 2015 a paper constraining the impact date to within 100 years using Bayesian statistical analyses, now proposed as 12,835 -12,735 years ago(j).
Coincidentally, Professor Emilio Spedicato independently arrived at the conclusion that it was a cometary impact in the North Atlantic that was responsible for the Younger Dryas. Subsequently, when temperatures rose again it resulted in the flooding of vast areas of low-lying landmasses that in Spedicato’s opinion, included Atlantis, which he locates in Hispaniola.
Conflicting evidence regarding the possibility of the Younger Dryas being caused by such an impact is impartially outlined on the internet(c).
December 2014 saw Graham Hancock raising the issue of a cometary cause for the Younger Dryas and its possible association with ancient Egypt(f).
The November 2013 issue of the BBC Focus magazine (p.30) had a brief article on the impact theory, noting that the northern hemisphere saw a drop of as much as 15°C around 11,000BC. In the absence of a suitable impact crater there is still much scientific scepticism(d).
However in early 2017, further possible evidence of an impact at the start of the Younger Dryas was offered by a team led by Christopher Moore of the University of South Carolina, when they identified a distinct layer of platinum in the soil that coincided with the start of YD. Commenting on this anomaly Moore noted that “Platinum is very rare in the Earth’s crust, but it is common in asteroids and comets.”(i)
In early 2018, two papers were published online(k), reinforcing the YD impact theory and adding evidence that the event resulted in a conflagration that “may have consumed – 10 million km2, or – 9% of Earth’s terrestrial biomass”.*Related to this is a paper by Andrew Collins that draws attention to the ‘Usselo horizon’, a charcoal-rich layer of between 1 and 8 inches, found on all continents, indicating widespread fires, now dated to 12,900 years ago(n).*
Ice cores from Greenland indicate a further cooling period circa 6200 BC that may be related to the abandonment of many Neolithic settlements during this period. Other periods of abrupt climate change have been identified from 3800 BC to 3500 BC and 2800 BC to 2000 BC.
The fact that Plato’s apparent date for the demise of Atlantis, circa 9600 BC, roughly corresponds with the current, best estimate for the date of the Younger Dryas is interesting but unfortunately not conclusive proof of any direct connection. In the absence of any supportive archaeological evidence, a linkage between Atlantis and the Younger Dryas will have to remain a matter of faith rather than fact. Interesting but inconclusive.
Recent discoveries in northern Sudan of dozens of skeletons, the majority of whom were apparently killed by flint-tipped arrows, have led to the suggestion(e) they were the result of food shortages resulting from the Younger Dryas that in turn led to warfare over diminished food availability.
(c) http://blogs.nicholas.duke.edu/thegreengrok/climatedebate/ (offline Dec. 2016) See: https://web.archive.org/web/20130310032309/http://blogs.nicholas.duke.edu/thegreengrok/climatedebate/
Richard Firestone together with his co-authors Allen West and Simon Warwick-Smith have written one of the most impressive accounts of a cosmic collision that led to the extinction in North America of large mammals such as the mammoth and sabre-toothed tiger and the concurrent disappearance of the Clovis people at the end of the last Ice Age. Their impact theory also offers a credible explanation for the Carolina Bays. However, they propose that this collision had catastrophic global consequences. The three scientists are prepared to consider the possibility that Plato’s Atlantis story, however garbled, is related to the same episode[0110.328]..
Since the publication of their book some evidence(a) has emerged that would appear to conflict with their core thesis. This criticism appears to be gaining support according to a May 2011 report(b)(d). However, in September 2012 it was reported that further intensive investigation has revealed flaws in the evidence gathering of Firestone’s critics(f). The interdisciplinary team of scientists from seven U.S. institutions concluded that “a disregard of three critical protocols, including sorting samples by size, explains why a group challenging the theory of a North American meteor-impact event some 12,900 years ago failed to find iron- and silica-rich magnetic particles in the sites they investigated.”
Strong resistance to the Firestone claims continued into 2013 when the Royal Holloway and the Sandia National Laboratories along with 13 other universities across the United States and Europe mounted further challenges(g).
The waters were muddied further when it was revealed that Allen West was formerly known as Allen Whitt, who was convicted in California of posing as a state-licensed geologist(b) and fined $4,500! He legally changed his name in 2006. His respected co-authors were apparently unaware of his history and as a consequence of West’s central role in the data gathering, the hypothesis is considered by some to be tainted. This may be a case of shooting the messenger instead of the message, a view discussed at length on the Internet(e).A spirited defence of both West in particular and the theory of the team in general has also been written(c) and should be read in order to get a more balanced view of this particular controversy.
The core debate has rumbled on ever since. In July 2015 the University of California, Santa Barbara, released the results(h) of research, led by James Kennett, which again supported the impact theory and “has narrowed the date to a 100-year range, sometime between 12,835 and 12,735 years ago.”
The battle has continued, apparently inconclusively, with more papers being published by all sides. July 2018 saw an update of the controversy published on the Science News website(i), with no sign of the war ending.
*Nevertheless, in late 2019, further evidence has emerged that appears supportive of Firestone’s theory. Where previously nanodiamonds were an important feature in the presentation of his ideas the latest studies focus on platinum as an important marker(j).*
Inspiration resulting from an interview with Firestone led Kevin Curran to a study that ended with the publication of Fall of a Thousand Suns, in which he investigates the effect of extraterrestrial encounters on the development of early religious beliefs.
Brazil has had few serious investigators propose it as the location of Atlantis. Although, in 1947 Harold T. Wilkins claimed[0363.97] that Quetzalcoatl was from Atlantean Brazil. Earlier in the 20th century, Col. P.H. Fawcett, the famous explorer, disappeared while searching in the Brazilian rain forest for a ‘lost city’ that he called ‘Z’. A 2009 book by David Grann about Fawcett’s searches in Brazil, entitled The Lost City of Z  was the basis for a film released in 2016. Sprague de Camp listed[0194.329] a George Lynch supporting a Brazilian Atlantis in 1925. In fact, Lynch was a fund-raiser for Fawcett.
However, although there is growing evidence of ancient roads, plazas and bridges in Brazil’s vast tropical forests, further data is needed before we can attempt to fit these structures into any specific culture or chronology.
An article(e) in the August 2017 of Antiquity offers evidence that humans lived in Brazil more than 20,000 years ago, which is many millennia before the Clovis people arrived in North America.
The possibility of Phoenician contact with Brazil has a number of supporters and a range of websites supports this controversial view(a). One such advocate, Ronald Barney, maintains that they concentrated their influence in the northeastern region of the country citing the work of Ludwig Schwennhagen and Apollinaire Frot(f).*There would appear to be evidence for 3rd century AD Roman contact with Brazil(h).*
May 2013 saw a flurry of media interest when a Japanese submersible found evidence in the form of granite suggesting of a previously unknown continental mass that sank about 900 miles off the coast of Rio de Janeiro. Members of the expedition have played down any attempt to link this discovery with Atlantis(b)(c).
This reminiscent of the reaction in 1931 when two islands were reported to have emerged from the sea off Brazil and within a short time, claims that they were a returning Atlantis were widely quoted(d).
Any suggestion that the land of Hy-Brasil in Irish mythology has any connection with Brazil or Atlantis is just wild speculation.
(g) See: Archive 3480
Gábor Bihari is a Hungarian researcher who has written about Atlantis in his native language, in a book entitled Atlanticas. A sample chapter, in English, is available on the Internet(a) while he seeks an American publisher. His main contention is that in Palaeolithc times a group of Europeans used the Atlantic currents to carry them to the Caribbean, where over time they developed a sophisticated culture on some of what were then much larger islands. The ending of the Ice Age resulted in the flooding of much of their homeland, forcing some to migrate to the American mainland, becoming the Clovis People, while others made the journey back to the Mediterranean bringing the story of a flooded empire in the far west. Much later, elements of this historical story were incorporated into the morality tale of Atlantis presented to us by Plato.
However, Professors Jennifer Raff and Deborah Bolnick co-authored a paper offering evidence(b) that the genetic data only supports a migration from Siberia to America.
Bihari submitted a paper entitled Atlantis as a Prehistoric Empire of the Americas? to the 2008 Atlantis Conference in Athens.
(a) http://www.com/NF1.htm (link broken 15/07/14)