Spartel Island *
Spartel Island also known as the Majuan Bank, was situated just west of the Strait of Gibraltar and according to Jacques Collina-Girard was the site of Atlantis. There is little doubt that before the last deglaciation, Spartel was dry land.
Marc-Andre Gutscher from the University of Brest subsequently added some support to Collina-Girard’s theory based on his interpretation of new bathymetric data and was prepared to debate the viability of human habitation on Spartel around 9600 BC. According to Gutscher, a large earthquake hit the island 12,000 years ago. Furthermore, there is also evidence of at least eight subsequent earthquakes, each of which could have resulted in a drop of the seafloor by several metres.
Accordingly, Gustcher speculated that Spartel circa 9600 BC could have been 40 metres higher than expected. However, at this early date, he would not expect the Bronze Age civilisation described by Plato to have existed on the island but his sonar investigation did not reveal any suggestion of an extinct civilisation.
“He calculated that between 20,000 and 12,000 years ago Spartel shrank from 6.5 x 4 km to less than a km across. A high-resolution map he made with sonar indicated that the island was even smaller than Collina-Girard had speculated, meaning it would have been uninhabitable as long as 14,000 years ago. But the sediment gathered by Gutscher tells a different story. A magnitude 9 earthquake appears to have rocked the region around the believed time of Atlantis’ doom, Gutscher reports in the August 2005 issue of Geology. At that time, the island would have been big enough to be inhabited. He also found evidence of subsequent earthquakes and tsunamis–apparently every 2000 years–that may have whittled the rest of the island away.” (c)
Gutscher found no evidence to support an ancient culture. “I will admit I was hoping to find concentric structures or walls of some kind,” he says, “but we didn’t”
Gustcher later withdrew his support for a Spartel Atlantis(a). However, Collina-Girard continues to advocate the idea, expanding on his views in a 2009 book, L’Atlantide retrouvée? Enquête scientifique autour d’un mythe.
Further criticism of Collina-Girard’s theory has been voiced by Alain Moreau(b).
(b) https://www.mondenouveau.fr/continents-disparus-les-fausses-atlantides-antarctique-ile-du-cap-spartel-partie-4/ (link broken Oct. 2017)
(c) https://www.science.org/content/article/atlantis-rises-again (pay wall)*