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In Our Time
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The big ideas which form the intellectual agenda of our age are illuminated by some of the best minds. Melvyn Bragg and three guests investigate the history of ideas and debate their application in modern life. |
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BIOGRAPHY
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| "I'm fascinated by the fact that we live in a time when so many people are doing fantastic work, and thinking in areas which it's not remotely possible for me to keep up with & and these people are prepared to talk about it. They're prepared to come on In Our Time and other programmes on Radio 4 and try and talk to the rest of us ..." |
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THE CAMBRIAN EXPLOSION
Click here to view Richard Corfield's Cambrian clock
Find out more about this subject by using our special research page
In the Selkirk Mountains of British Columbia in Canada, there is an outcrop of limestone shot through with a seam of fine dark shale. A sudden mudslide into shallow water some 550 million years ago means that a startling array of wonderful organisms has been preserved within it. Wide eyed creatures with tentacles below and spines on their backs, things like flattened rolls of carpet with a set of teeth at one end, squids with big lobster-like arms. There are thousands of them and they seem to testify to a time when evolution took a leap and life on this planet suddenly went from being small, simple and fairly rare to being large, complex, numerous and dizzyingly diverse. It happened in the Cambrian Period and it's known as the Cambrian Explosion.
But if this is the great crucible of life on Earth, what could have caused it? How do the strange creatures relate to life as we see it now? And what does the Cambrian Explosion tell us about the nature of evolution?
Contributors
Simon Conway Morris, Professor of Evolutionary Palaeobiology at Cambridge University
Richard Corfield, Visiting Senior Lecturer at the Centre for Earth, Planetary, Space and Astronomical Research at the Open University
Jane Francis, Professor of Palaeoclimatology at the University of Leeds
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