<p>Rana Mitter talks to geologist Iain Stewart and geographer Nicholas Crane about the concept of "Deep Time".</p>

Rana Mitter talks to geologist Iain Stewart and geographer Nicholas Crane about the concept of "Deep Time".

Proms Extra - Deep Time

<p>Leading thinkers discuss the ideas shaping our lives – looking back at the news and making links between past and present. Broadcast as Free Thinking, Fridays at 9pm on BBC Radio 4. Presented by Matthew Sweet, Shahidha Bari and Anne McElvoy.</p>

Society & Culture

Leading thinkers discuss the ideas shaping our lives – looking back at the news and making links between past and present. Broadcast as Free Thinking, Fridays at 9pm on BBC Radio 4. Presented by Matthew Sweet, Shahidha Bari and Anne McElvoy.

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Proms Extra - Deep Time

Proms Extra - Deep Time

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