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Submarine islands off Brazil and in the Caribbean

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Postby Riaan » Fri Sep 25, 2009 2:29 am

For those of you that may be interested, herewith some more underwater 'coincidences'. The maps below show several 'mythical' islands that have corresponding locations below sea level.

The dotted plateaus must represent partially submerged plateaus with hills forming islets.

How did he know about these?

Image

Mercator (top) MS Encarta (centre) NASA Bathymetry (bottom)

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Mercator (top) What is visible today (bottom)

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Details here http://www.riaanbooysen.com/terra-aus/87-terraproof1?start=9

Any thoughs (apart from this being nonsense)?
Riaan
 
Posts: 10
Joined: Tue May 05, 2009 2:24 pm

Postby Riaan » Wed Oct 07, 2009 12:40 pm

Feedback received from one of the forums I posted this article on was that the islands on the sub-merged plateaus in the Caribbean may simply have been warnings to sailors of shallow waters in those areas. This sent me back to the drawing board (actually, my map books and the Internet in search of topographical information about the ‘shallow water’ areas of the Caribbean). I soon discovered the 1625 map of the Caribbean by Henry Briggs (below, centre), which clearly differentiates between shallow waters (dashed lines) and islets within these regions. What happened to these islets?

Image

I contacted several leading authorities on oceanography in search of high resolution bathymetry maps, who were quick to point out that many of these islands (typically sand banks one or two meters above sea level) had been washed away by hurricanes. A good example of this is in fact the Dry Tortugas (E on my figures) http://en.wikipedia.org/wiki/Dry_Tortugas, of which some islands have disappeared as late as 1875.

Based on this evidence I have to conclude that the mapping of the Caribbean most likely had very little to do with maps dating from thousands of years before and that the information must indeed have been obtained by the early Portuguese and Spanish explorers. :cry:

The same cannot necessarily be said of the Brazilian islands, though, unless the disappearance of islands B to D and the second island of group E can be attributed to some (other) kind of natural phenomenon active over the past 500 years (any ideas?). The island group E is visible from the sky (NASA shallow topography map below), but the others are definitely deeper below sea level. The Encarta Interactive World Atlas ocean floor topography seems to be in error (see Fig. 1.62a) as it suggests that these ‘islands’ are more than 90m below sea level, which does not appear to be the case judging from the other files.

Image

Hires images of these figures can be downloaded here http://www.riaanbooysen.com/terra-aus/87-terraproof1?start=9
Riaan
 
Posts: 10
Joined: Tue May 05, 2009 2:24 pm


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