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00:59:06
Iain Stewart, Dean Ah Chee, Mike Archer
8
To reveal Eurasia's origins, Prof Iain Stewart climbs up to the "eternal flames" of Mount Chimaera and explains that where the South of Eurasia is today, there was once a ninety-million-square-kilometre Ocean known as the Tethys. Destruction of the Tethys Ocean led to Eurasia's formation. The freshwater fish called Karimeen, from the backwaters of Kerala in Southern India is a clue that India was once four thousand kilometres south of its current position on the other side of the Tethys, joined to Madagascar.
Curious stones, called saligram by the locals,
Minerals like ilmenite and magnetite.
Look at this. This is an andesite without all those bubbles
it pumped billions of tonn of ash and toxic gas
You can see evidence of that cataclysm in the hills outside Mumbai,
The innards, the guts of an ancient volcano.
Now, in most cichlid, the anal fin's got three or four spines
So the thing is that the source of this volcanism isn't to be found
Subduction generally happens when ocean crust meets continental crust.
What I'm looking for is hard, black nodule,
These are the gentle backwater of Kerala in southern India.
They're marked out by a couple of anatomical quirk
To transform plankton into gas,
and cities like this could become crucible of invention and innovation.
It's soot - essentially carbon.
In fact, no land vertebrate larger than 25 kilogram made it through.
Evidence that can be found 500 kilometre southeast of Istanbul,
and it means that the basalt contains a record of its position
It's one of those words for a geologist that conjures up these images.
Now, if you could look into those tiny speck
kind of black lumps of shale
They're small enough - they can get into nook and crannies
It's water vapour,
scrunch upwards as the two continents ploughed into each other.
And as they grow they encase tiny quantities of magma,
Unlike volcanoes like Hawaii and Etna that spew out these huge lava flows,
and this thing just crumble and collapsed back down into the sea,
are brim with the remains of ancient sea creatures.
were created as India plough into the rest of the continent,
All over these hills, there's gems like these just carve into the lava.
when dinosaurs roam the land,
As the ocean crust descend beneath the continental crust,
but I reckon we're looking at the ultimate one here - rats.
And that it was the movement of India that ultimately pave the way
this slowly choke the planet and poisoned the oceans,
that are scatter across the ancient world.
Cities like this are physically hem in and isolated from the neighbours.
tuck snugly in beside Madagascar, is India.
Cities like this are physically hemmed in and isolate from the neighbours.
Evidence that shows how Eurasia was assemble
Called Pangaea, it was a land dominate by the dinosaurs...
that pulls the ocean crust and in turn haul the landmasses behind it,
You can see up here, China and Siberia fuse together.
it melt away the base of the continental plate.
This whole landscape is steep in myth.
the ocean floor at the margins of the Tethys was thrust upwards...
inexorably closing the Tethys, creating Eurasia.
tucked snugly in beside Madagascar, is India.
It's absolutely stunningly beautiful,
In a way, the extinction was curiously selective.
In fact, no land vertebrate larger than 25 kilograms made it through.
This process happens spontaneously at around 140 degrees...
Hey! Welcome aboard.
For 300 million years subduction has been gradually,
this volcano's eruptions are almost exclusively explosive.
is essentially the story of how the Tethys died.
And that it was the movement of India that ultimately paved the way
This is the Mediterranean Sea, instantly recognisable on a map.
It's at his rear end, basically, the anal fin.
partly because it comes all the way from China
Somewhere round that cloud and mist
which rise up and eventually burst out as volcanoes.
But, now travelling twice as fast, it crashed into the rest of Eurasia...
It's absolutely stunningly beautiful,
I'm here to find something truly ancient,
They've certainly got all the essential traits for survival.
Nearly half the world's population.
which allows you to pinpoint exactly where it formed.
isn't one you'd immediately associate with a volcano.
Fossilised sea creatures.
A huge column of superheated rock
one of the cataclysmic geological events in the planet's past.
And, in food, they're voracious eaters. They eat anything.
This is the Mediterranean Sea, instantly recognisable on a map.
can be found in the southernmost tip of India.
..and left an indelible mark on the landscape...
..just as fearsome marine reptiles ruled the Tethys.
A geochemical analysis of these flames indicates
Many of the great Eurasian civilisations sprung up
IAIN'S VOICE ECHOES: ..viscous and sticky...
..and is, for the local fishermen, these waters' most prized catch.
Molten rock that came out, solidified
in a series of monumental collisions...
Maybe it's because we live in the land that it's tempting to think
This is a fragmented landscape.
of an extinct member of the squid family.
I mean, these ammonites were swimming around in Jurassic seas
They're marked out by a couple of anatomical quirks
It's such a surreal scene.
They occupied fertile river valleys that grew up
..catastrophic impacts
In Turkish they're called Yanartas, which is just "flaming rock".