Monday, 30 July 2012

Doggerland: Sunken Greater Britain

Doggerland: Sunken Greater Britain
Doggerland, a now submerged area of the North Sea, was once larger than many modern European countries

A map of the UK with Doggerland marked as red
 A map of the UK with Doggerland, now sunken,  marked as red



“Doggerland was the real heartland of Europe until sea levels rose to give us the UK coastline of today. We have speculated for years on the lost land’s existence from bones dredged by fishermen all over the North Sea, but it’s only since working with oil companies in the last few years that we have been able to re-create what this lost land looked like.

“When the data was first being processed, I thought it unlikely to give us any useful information, however as more area was covered it revealed a vast and complex landscape. We have now been able to model its flora and fauna, build up a picture of the ancient people that lived there and begin to understand some of the dramatic events that subsequently changed the land, including the sea rising and a devastating tsunami.”

- Dr Richard Bates.

Richard Bates At Work - Credit:  University of St. Andrews


The research project is a collaboration between St Andrews and the Universities of Aberdeen, Birmingham, Dundee and Wales Trinity St David.

Rediscovering the land through pioneering scientific research, the research reveals a story of a dramatic past that featured massive climate change. The public exhibit brings back to life the Mesolithic populations of Doggerland through artefacts discovered deep within the sea bed.

The research suggests that the populations of these drowned lands could have been tens of thousands, living in an area that stretched from Northern Scotland across to Denmark and down the English Channel as far as the Channel Islands.

The research, a result of a painstaking 15 years of fieldwork around the murky waters of the UK, is one of the highlights of the London event.

The interactive display examines the lost landscape of Doggerland and includes artefacts from various times represented by the exhibit – from pieces of flint used by humans as tools to the animals that also inhabited these lands.

Using a combination of geophysical modelling of data obtained from oil and gas companies and direct evidence from material recovered from the seafloor, the research team was able to build up a reconstruction of the lost land.

The findings suggest a picture of a land with hills and valleys, large swamps and lakes with major rivers dissecting a convoluted coastline. As the sea rose the hills would have become an isolated archipelago of low islands. By examining the fossil record (such as pollen grains, microfauna and macrofauna) the researchers can tell what kind of vegetation grew in Doggerland and what animals roamed there. Using this information, they were able to build up a model of the ‘carrying capacity’ of the land and work out roughly how many humans could have lived there.


The fossilised remains of a mammoth uncovered from the area - Credit:  University of St. Andrews


The research team is currently investigating more evidence of human behaviour, including possible human burial sites, intriguing standing stones and a mass mammoth grave.

Dr Bates continued, “We haven’t found an ‘x marks the spot’ or ‘Joe created this’, but we have found many artefacts and submerged features that are very difficult to explain by natural causes, such as mounds surrounded by ditches and fossilised tree stumps on the seafloor.

“There is actually very little evidence left because much of it has eroded underwater; it’s like trying to find just part of a needle within a haystack. What we have found though is a remarkable amount of evidence and we are now able to pinpoint the best places to find preserved signs of life.”

The only lands on Earth that have not been extensively explored are those that have been lost to the oceans. After the end of the last Ice Age extensive landscapes that had once been home to thousands of people were inundated by the sea. Although scientists predicted their existence for many years, exploration has only recently become a reality.


A virtual visualisation of an Agent Based model of life in the Mesolithic on the Doggerbank - Credit: Dr. Eugene Ch'ng, University of Birmingham


The exhibit explored those drowned landscapes around the UK and shows how they are being rediscovered through pioneering scientific research. It reveals their human story through the artefacts left by the people - a story of a dramatic past that featured lost lands, devastating tsunamis and massive climate change. These were the challenges that our ancestors met and that we face once more today.


How it works


Current climate change and associated sea level rise are at the forefront of social and scientific discussion, but research shows that dramatic changes in the environment have occurred numerous times in the past.

One of the most significant landscapes lost to sea level rise is the European world of Doggerland. Occupying much of the North Sea basin, this inundated landscape, bigger than many modern European countries, was slowly submerged between 18,000 BC and 5,500 BC. Archaeologists now consider Doggerland to have been the heartland of human occupation within Northern Europe at that time, but understanding it depends on being able to locate and visualise the landscape.

Scientists have taken a new approach to this by coupling geophysical survey techniques developed by the oil industry with 3D visualisation technologies developed by the computer modelling industry. These innovative methodologies allow the recreation of these once inhabited landscapes, mapping rivers, lakes, hills, coastlines and estuaries, and the modelling of the flora and fauna associated with them. These models bring back to life the homeland of these Mesolithic populations, tantalisingly hinted at by artefacts recovered from the seabed. They also allow scientists to explore the effects of sea level rise upon the landscape and its populations in new and more immersive ways that may help the past provide solutions for the present.

From Nanopatents and Innovations @ http://nanopatentsandinnovations.blogspot.com.au/2012/07/discovering-drowned-doggerland-european.html


Hidden Doggerland underworld uncovered in North Sea


…"Doggerland was the real heartland of Europe until sea levels rose to give us the UK coastline of today,” said Dr Bates.

"We have speculated for years on the lost land's existence from bones dredged by fishermen all over the North Sea, but it's only since working with oil companies in the last few years that we have been able to re-create what this lost land looked like.

"When the data was first being processed, I thought it unlikely to give us any useful information, however as more area was covered it revealed a vast and complex landscape.

"We have now been able to model its flora and fauna, build up a picture of the ancient people that lived there and begin to understand some of the dramatic events that subsequently changed the land, including the sea rising and a devastating tsunami."
Dr Richard Bates at work Dr Richard Bates at work building up a picture of the ancient landmass

Ancient tree stumps, flint used by humans and the fossilised remains of a mammoth helped form a picture of how the landscape may have looked.

Researchers also used geophysical modelling of data from oil and gas companies.

Findings suggest a picture of a land with hills and valleys, large swamps and lakes with major rivers dissecting a convoluted coastline.

As the sea rose the hills would have become an isolated archipelago of low islands.

By examining the fossil record (such as pollen grains, microfauna and macrofauna) the researchers could tell what kind of vegetation grew in Doggerland and what animals roamed there.

Using this information, they were able to build up a model of the "carrying capacity" of the land and work out roughly how many humans could have lived there.

The research team is currently investigating more evidence of human behaviour, including possible human burial sites, intriguing standing stones and a mass mammoth grave.

From BBC News @ http://www.bbc.co.uk/news/uk-scotland-edinburgh-east-fife-18687504


Channel's key role in pre-history

By Paul Rincon
 
Andy Currant (AHOB)
The remains we find today tell a story of Britain's ancient past
A study of prehistoric animals has revealed the crucial role of the English Channel in shaping the course of Britain's natural history.

The Channel acted as a filter, letting some animals in from mainland Europe, but not others.

Even at times of low sea level, when Britain was not an island, the Channel posed a major barrier to colonisation.

This was because a massive river system flowed along its bed, UK researchers told a palaeo-conference in Gibraltar.

Today the English Channel is 520km long, 30-160km wide, about 30-100m in depth and slopes to the south-west.

Even now, the bed of the Channel is incised by a network of valleys, the remains of the river system, which may have been cut by catastrophic drainage of meltwater from further north.

"It would have been an incredible barrier at times of high sea level, but it would also have been a formidable barrier at times of low sea level for populations trying to move south to north," said Chris Stringer of London's Natural History Museum.

Professor Stringer presented the results here at the Calpe conference, a meeting of pre-history experts from all over the world.

The big flood

The evidence comes from the Ancient Human Occupation of Britain Project (AHOB). This five-year undertaking by some of the UK's leading palaeo-scientists has reassessed a mass of scientific data and filled in big knowledge gaps with new discoveries.

Chris Stringer's co-researchers Andy Currant, Danielle Shreve and Roger Jacobi have been studying how the mammal fauna of Britain has changed over the last 500,000 years.
See how the English Channel changed through time



During that period, animals have colonised, abandoned and re-colonised Britain many times as the climate shifted from warm to cold and back to warm.

The Channel is thought to have formed during a cold period 200,000 years ago or more.

Meltwater from an ice sheet formed a lake, which then overflowed in a catastrophic flood - cutting through a chalk ridge that previously connected Britain to France.

Changes in climate were accompanied by changing sea levels. At the height of an ice age, these would have been low. During interglacial periods, when the climate was warm, sea levels rose.

But even when water was locked up in the ice sheets and sea levels plummeted, the Rhine and the Thames rivers dumped meltwater into a major river system that flowed along the floor of the Channel.


Unusual collections

This means that once the Channel formed, there was never again a simple land crossing to be made from northern France to Britain.

"We find we're getting only a selection of the mammals during the British interglacials that there are in mainland Europe," said Professor Stringer.

For example, at one pre-historic site, researchers found hippopotamus and fallow deer; but unlike mainland Europe at the time, there were no horses and no humans.

"This suggests that the Channel, or the Channel river system, is acting as a filter to prevent the movement of some of these [mammal] forms into Britain," Professor Stringer added.

Once sea levels rose high enough for Britain to be an island, the select fauna that had made it across from mainland Europe could develop in extraordinary ways.

During one warm stage, about 80,000 years ago, fossils from Banwell Cave in Somerset show Britain was populated by some very unusual animals. These included reindeer, bison, and a giant bear similar to a polar bear.

Interestingly, there are no hyena fossils at Banwell Cave, as there were in mainland Europe. Instead, it appears, their role in the food chain may have been taken up by wolves.

"The wolves were developing much larger jaws. Their teeth show incredible signs of breakage and wear as if they're chomping bones like hyenas," said Professor Stringer.

The mammals at Banwell seem to be the kinds of animals normally found today in cold regions. But they lived in Britain during a warm stage and seemed to be adapting to their new environment.

The team thinks the antecedents of these animals must have arrived in Britain when the climate was cold. But when conditions warmed up, sea levels rose and isolated Britain, marooning this cold-adapted fauna in a warm land.


The HISTORY of HUMANS and OTHER ANIMALS in BRITAIN


Temperatures over the past 700,000 years (BBC/AHOB)

Major incursions were possible during periods of warmth

A number of important palaeo-sites mark the periods of influx

Extreme cold made Britain uninhabitable for thousands of years.





From BBC News @ http://news.bbc.co.uk/2/hi/science/nature/5352430.stm

For more information on Doggerland see http://en.wikipedia.org/wiki/Doggerland 

For more telling information on our flooded planet see http://nexusilluminati.blogspot.com/search/label/flooded%world




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