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Forum: General Forum
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Respond to: News item: Possible origin and role of the Channel
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rbatham
Joined:
04-04-2006
Messages: 679
from Western Australia
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|  New Message Posted!2006-10-25 02:51
Quote:
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On 2006-10-24 23:53, kooljeff wrote:
[quote]
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The sinking is happening in a South Easterly direction so that Hampshire Sussex, Kent, Essex and East Anglia are slowly sinking. Which doesn't bode well for me as I live in Portsmouth. Mind you anyone who lives in Norfolk and Suffolk - I'd leave now if I were you 
[/quote] Yes, Norwich, the new Atlantis. Roy
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kooljeff
Joined:
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Messages: 40
from Hampshire
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|  New Message Posted!2006-10-24 23:53
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Scotland is rebounding from the ice load, agreed. (Stanford U, "A Churning Planet") Text-searching this for ice age brings up a little bit. I find no mention of England's being cantilevered upward.
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Think of the crust that is Britain floating on a kind of water bed (the underlying soft rock) when the weight of the ice pressed down on the norther part (Scotland etc) the weight pushed down scotland squeezing the soft rck towards the south, thereby raising it. When the ice retreated the pressure was relieved and Scotland and Scandanaxia are "rising". The south is "sinking". Evidence for this can be found in the Solent (between Portsmouth & Isle of Wight). The Solent was once a forested valley but as the land sank the water oozed in gradually cutting off the IoW from the mainland. The remains of this forest can be found underwater and on the beaches at low tide. The shift is still happening and prehistoric settlements on the Farlington marshes are slowing being covered by water.
The sinking is happening in a South Easterly direction so that Hampshire Sussex, Kent, Essex and East Anglia are slowly sinking. Which doesn't bode well for me as I live in Portsmouth. Mind you anyone who lives in Norfolk and Suffolk - I'd leave now if I were you
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cropredy
Joined:
01-01-2006
Messages: 5540
from Oxon
 ON-Line
| New Message Posted!2006-09-18 16:03
I consider that we learnt about the special properties of limestone whilst living in caves, hiding from the extremes of hot and cold.
If you go over to Le Havre in France you meet up with the limestone that once was connected to England, there are lots of caves in there.
http://www.change.freeuk.com/learning/geog/caves.html
I dont know about these creationists?, but they sure do have great sites?
http://www.answersincreation.org/caves.htm
Kevin
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AnewMerlinian
Joined:
17-12-2004
Messages: 164
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| New Message Posted!2006-09-18 00:20
Kevin it's good to correspond again. Please have a look at this:
Glacial Map of Britain, South Sheet, (.pdf)
The North Sheet, and printed copies, are also available:
The University of Sheffield | Britice, the British Ice Sheet
Scotland is rebounding from the ice load, agreed. (Stanford U, "A Churning Planet") Text-searching this for ice age brings up a little bit. I find no mention of England's being cantilevered upward.
As for the Severn, the ice-map seems to show, it could have run clear about as soon as it left the Cambrians; and looking at the landform-map, it's difficult to imagine any significant amount of its water being diverted elsewhere. However, to the northeast, the Fens and Lincoln Heath were inundated. There, apparently, was at least part of the ice-dammed lake which would later break loose to carve the channel.
Following flint. Yes, here was a real resource. Where there was that and game, people would go and stay.
Amazing properties of chalk? Magic is where you find it. If you believe, it's real; whether it works as intended or not.
[ This message was edited by: AnewMerlinian on 2006-09-18 00:39 ]
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cropredy
Joined:
01-01-2006
Messages: 5540
from Oxon
ON-Line
| New Message Posted!2006-09-17 19:01
I have seen reports that say that a lot of the rivers that at present feed the severn , at one time flowed the opposite way and fed the thames ( cant find at the moment )
This was linked to the tremendous weight of the ice sheets actually pressing Scotland down, and the South of England popping upwards, as the ice melted this began to alter as Scotland raised upwards and Southern England sank, I believe it is stiil ongoing?
I went over to France last week and was looking at the cliffs at Dover , thinking how easy it would have been to locate flint , then once they had exhausted the supply , perhaps they migrated along the chalk/limestone, always looking for flint and learning all the time of the properties of chalk?
If you work with something for long enough you can discover many secrets about it?, easily forgotten as new metals came on the scene?
Kevin
[ This message was edited by: cropredy on 2006-09-17 19:02 ]
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AnewMerlinian
Joined:
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Messages: 164
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| New Message Posted!2006-09-17 14:15
Quote:
| The channel is relatively shallow, with an average depth of about 120 m at its widest part, reducing to about 45 m between Dover and Calais. From there Eastwards the sea continues to shallow to about 26 m in the Broad Fourteens where it lies over the watershed of the former land bridge between East Anglia and the Low Countries. ...
Before the end of the Devensian glaciation (the most recent ice age) around 10,000 years ago, the British Isles were part of continental Europe. During this period the North Sea and almost all of the British Isles were covered with ice. The sea level was about 120 m lower than it is today, and the channel was an expanse of low-lying tundra, through which passed a river which drained the Rhine and Thames towards the Atlantic to the west. As the ice sheet melted, a large freshwater lake formed in the southern part of what is now the North Sea. As the meltwater could still not escape to the north (as the northern North Sea was still frozen) the outflow channel from the lake entered the Atlantic Ocean in the region of Dover and Calais.
At some point around 6500 BCE, catastrophic erosion swept away the chalk to create the English Channel, leaving the iconic white cliffs of Dover. Wave action on the soft, chalk cliffs widened the Channel further, a process which continues today.
English Channel - Wikipedia
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One thing we might want to remember about the Thames and its flow is that it was, until 'recently', substantially greater during the Kennet's risings. (This has been reduced -- much to the concern of the river's keepers -- http://www.riverkennet.org/ ).
An additional factor at the end of the last ice-age would, likely, have been glacial melt ...potentially making the Thames very formidable indeed. The river appears to have cut where it needed to, (Goring Gap), but one should consider that rivers need some decline to cut effectively -- even with large quantities of water involved. (The lower Mississippi river meanders, not for a lack of water, but because the slope is shallow.) After leaving Goring, the Thames travels approximately 64 miles, (as the crow flies), to the estuary, while dropping about 80 meters. Reason to meander a bit.
A related question would be whether the land bridge existed at all, or whether it was a lake -- perhaps frozen over in winter, between the ice wall and the confluence of the Thames and Rhine, (a sight to behold).
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rbatham
Joined:
04-04-2006
Messages: 679
from Western Australia
OFF-Line
| New Message Posted!2006-09-17 12:33
[quote]
On 2006-09-16 23:15, AnewMerlinian wrote:
BBC NEWS | Science & Nature | Channel's key role in pre-history
[ This message was edited by: AnewMerlinian on 2006-09-16 23:17 ]
[/quoteI I read this with some interest. I get confused, and wish that the experts in variuos fields would get together and make some consensus of opinion. It seems there has always been a channel of sorts, even a raging river fed by the Rhine and Thames. The Rhine I can understand, rising iin tha alpine regions. But the Thames? a raging torrent? hardly likely, rises in the Cotswolds and meanders across fairly flat country and has never deeply scoured it's valley. Study of coral reefs in the tropics shows that sea levels were possibly 300ft lower 8,000 yrs ago means that the channel was sea, though may have been a river Even most of the north sea would have been dry land. evidence of flint artefacts and mammoth bones go to prove this .Roy
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AnewMerlinian
Joined:
17-12-2004
Messages: 164
OFF-Line
| New Message Posted!2006-09-16 23:15
BBC NEWS | Science & Nature | Channel's key role in pre-history
[ This message was edited by: AnewMerlinian on 2006-09-16 23:17 ]
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