A lost 8th continent is hidden nearly 1,000 miles under Europe, new research shows. Scientists named it 'Greater Adria.'

A lost 8th continent is hidden nearly 1,000 miles under Europe, new research shows. Scientists named it ‘Greater Adria.’

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A lost 8th continent is hidden nearly 1,000 miles under Europe, new research shows. Scientists named it ‘Greater Adria.’

Not all the continents missing are myths like Atlantis; here is one whose existence is only scientifically confirmed. Greater Adria broke off from North Africa 240 million years ago. About 120 million years later, it started sinking beneath Southern Europe. But bits of it remain, scattered across local mountain ranges.

Greater Adria, science’s newest lost continent, tore off from North Africa and was subducted beneath Southern Europe.

It was the geographical resemblances in those mountains that had led scientists to hypothesise the presence of an ancient continent in the Mediterranean.

But the region’s geology is so complex that only recent advances in computing—and a 10-year survey by an international team of scientists—were able to produce a geo-historical outline of that former landmass. This is the very first map of the world’s latest lost continent.

Topographic map of the Mediterranean Sea basin, once home to the continent of Greater Adria.

The 100-million-year history of Greater Adria starts nearly a quarter of a billion years ago. The world was a very different place back then. It was just recovering from the Permian-Triassic extinction, which came pretty close to wiping out all life on Earth. The planet was repopulated by the first mammals and dinosaurs.

Supercontinental break-up

All together now: the supercontinent of Pangaea (335-175 million years ago).

Oblivious that biological imperative, Earth’s geology was on a course of its own: fragmentation. At that time, the planet’s land masses had coagulated into a single supercontinent, Pangaea.

Around 240 million years ago, a Greenland-sized piece of continental plate broke off from what would become North Africa and started drifting north. Between 120 and 100 million years ago, the continent smashed into Southern Europe. Even though the speed of that collision was no more than 3 to 4 cm per year, it ended up shattering the 100-km thick crust.

Most of the continental plate was pushed under Southern Europe and swallowed up by Earth’s mantle, a process known as subduction. Seismic waves can still detect the plate, now stuck at a depth of up to 1500 km.

But some of the sedimentary rocks on top were too light to sink, so they were scraped off and got crumpled up—the origin of various mountain chains across the Mediterranean region: the Apennines in Italy, parts of the Alps, and ranges in the Balkans, Greece and Turkey.

Death and birth

Flowing from present to deep past, this time-lapse reconstruction of the geological history of the Mediterranean shows the death and birth (in that order) of Greater Adria in unprecedented amounts of detail.

Some bits of Greater Adria survived both the shave-off into mountainhood and death by subduction.

“The only remaining part of this continent is a strip that runs from Turin via the Adriatic Sea to the heel of Italy’s boot,” says Douwe van Hinsbergen, Professor of Global Tectonics and Paleogeography at Utrecht University, and the study’s principal researcher.

That’s an area geologists call ‘Adria’, so the team, consisting of scientists from Utrecht, Oslo and Zürich, called the lost continent ‘Greater Adria’.

What was the continent like? A shallow continental shelf in a tropical sea, where sediments were slowly turned into rock, Greater Adria possibly resembled Zealandia, a largely submerged continent with bits sticking out (i.e. New Zealand and New Caledonia), or perhaps the Florida Keys, an archipelago of non-volcanic islands. Either way, dotted with islands and archipelagos above the water, and lots of coral below, it was “probably good for scuba diving,” Van Hinsbergen says.

It took scientists this long to produce the first map of Greater Adria not just because the Mediterranean is, in the words of Van Hinsbergen, “a geological mess (…) Everything is curved, broken and stacked. Compared to this, the Himalayas represent a rather simpler system.” Greater Adria perished by subduction and scraping-off. The Himalayas emerged by the collision of two continents.

Ore deposits

A reconstruction of Greater Adria, Africa and Europe about 140 million years ago. In lighter green, submerged parts of continental shelves.

The region also has a complex geopolitical makeup, obliging the researchers to piece together evidence from 30 different countries, from Spain to Iran, “each with its own geological survey, own maps, own ideas about evolutionary history. Research often stops at national borders.”


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