When Britain Split From Europe, in a Big Way

'The separation of Britain from Europe, set in motion by Prime Minister Theresa May last week, began a historic process but one not as abrupt as the first Brexit. That was the catastrophic destruction of the land bridge that for 10 million years had joined Britain physically to the Continent.

The bridge was a rock formation, about 20 miles wide, that ran from Dover to Calais and protruded several hundred miles into France and Britain. It was made of chalk, as can be seen in the cross-section where it has been ripped away at the white cliffs of Dover.

After many years of work, starting with the underwater surveys made in preparation for digging the Channel Tunnel, geologists have at last assembled a picture of the mighty forces that tore the bridge away and gave Britain its identity as an island, rather than a mere peninsula of Europe like Denmark and Scandinavia. Their account appears in Wednesday’s issue of Nature Communications.'>>>

https://www.nytimes.com/2017/04/04/science/britain-europe-split-land-bridge.html?