Salisbury Crags

A line of crags of igneous rock formed 342 million years ago, when lava erupted at Arthur’s Seat through the underlying sedimentary rock.

The crags are famous in the world of geology because it is where James Hutton (1726 – 1797), ‘the father of modern geology‘, concluded that the magma intruding into the existing rock had crystallised into dolerite.

This he used to illustrate his ideas on how rocks were formed by natural processes over a period of time¹Scottishgeology.com. (2022). Holyrood Park, Edinburgh: The volcano in the heart of Scotland’s capital city – Scotland – the home of geology. [online] Available at: https://www.scottishgeology.com/best-places/holyrood-park/ [Accessed 22 Jun. 2022]..

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  Scottishgeology.com. (2022). Holyrood Park, Edinburgh: The volcano in the heart of Scotland’s capital city – Scotland – the home of geology. [online] Available at: https://www.scottishgeology.com/best-places/holyrood-park/ [Accessed 22 Jun. 2022].