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RELATIVE DATING What is it ?. Who Dunit ? James Hutton Holyrood Park Edinburgh Castle Lets start with the story of James Hutton, a wealthy farmer born.

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Presentation on theme: "RELATIVE DATING What is it ?. Who Dunit ? James Hutton Holyrood Park Edinburgh Castle Lets start with the story of James Hutton, a wealthy farmer born."— Presentation transcript:

1 RELATIVE DATING What is it ?

2 Who Dunit ?

3 James Hutton Holyrood Park Edinburgh Castle Lets start with the story of James Hutton, a wealthy farmer born in As a farmer, it brought him into close contact with the land

4 James Huttons Revelation He was the first person to realise that the Earth must have been very much older than the 6,000 years believed at that time

5 Huttons Imagination Hutton was convinced that the lowlands of Scotland had been made at a later time than the uplands, but he did not have any proof UNTIL …

6 Siccar Point, Nr Edinburgh Whilst walking along the beach at Siccar Point, he noticed that the pebbles had come from the cliff – he now understood that the beach sand was made from the eroding cliffs – that was a big leap of imagination for its time

7 Huttons Story of Siccar Point He then noticed around the corner from the beach that some gently dipping red sandstones were lying on top of some grey-coloured upright layers From his observations, he began to unravel the story of what had happened to these rocks

8 RELATIVE DATING PRACTICAL

9 So, what is Huttons Story ? The grey-coloured beds (A) were laid down as horizontal layers of soft muds in the sea. A These were hardened into rock deep in the Earth and then buckled into folds by immense stresses.

10 So, what is Huttons Story ? These stresses also thrust the rocks up to the surface as great mountains, which were then eroded. A These mountains were likewise worn down, and formed the horizontal red beds (B) on top of the vertical grey rocks. B

11 So, what is Huttons Story ? What is his evidence? Fragments of the folded grey rock (A) are found in the red beds above it (B) – so the red beds must be younger. B A A A A A He didnt even need fossils to date his beds !

12 Fold Shape ANTICLINE younger older SYNCLINE younger older What do you think produces folds ?


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