Hutton at Siccar Point
Hutton realised that the processes of erosion, deposition and uplift were connected and operated continuously, driven by the earth’s internal heat, in a way not understood at the time. At Siccar Point in 1788, he finally found the clear evidence he needed to demonstrate his understanding of the processes and cycles that shaped the Earth.
Hutton arrived at Siccar Point by boat, accompanied by Sir James Hall of Dunglass and John Playfair. Playfair wrote: “Dr Hutton was highly pleased with appearances that set in so clear a light the different formations, and where all the circumstances were combined that could render the observation satisfactory and precise … We felt necessarily carried back to a time when the schistus on which we stood was yet at the bottom of the sea, and when the sandstone before us was only beginning to be deposited, in the shape of sand or mud, from the waters of the supercontinent ocean… The mind seemed to grow giddy by looking so far back into the abyss of time; and whilst we listened with earnestness and admiration to the philosopher who was now unfolding to us the order and series of these wonderful events, we became sensible how much further reason may sometimes go than imagination may venture to follow.”
Hutton inferred from the sharp junction between the two sets of rocks that an enormous interval of time was required for the underlying strata to be folded and eroded before the overlying sandstones were deposited. The fundamental geological principle of deep time was thus established and Hutton famously concluded his work Theory of the Earth with: “We find no vestige of a beginning – no prospect of an end”. Since then different geological eras have been recognised and dated, and we now know that the Earth is around 4.5 billion years old.
Hutton’s discoveries fulfilled a tremendous mission: placing geology in a much wider time frame than the popular belief that the Earth was created in 4004 BC (as calculated by Bishop Ussher in 1650). This enabled geology to become a science in its own right with Hutton as its founding father.
The Hutton Memorial Garden, Edinburgh
This garden marks the exact site of Hutton’s house and garden at the original 3 St John’s Hill, the house where he lived for almost 30 years and where he died on 26th March 1797. The garden was created in 1997. It contains examples of important rock types associated with Hutton’s life. Two boulders showing granitic veins came from Glen Tilt which John Clerk of Eldin visited with James Hutton and illustrate Hutton’s work on the origin of granite from September 1785. The other three boulders are of conglomerate carried by ice and water came from Barbush on the edge of Dunblane. These illustrate Hutton’s understanding of the cyclicity of geological processes. The garden can be accessed from Veiwcraig Gardens off Holyrood Road, take the steps up to the garden from the first bend of the road, near to the Holyrood Road NCP Car Park – Edinburgh EH8 9UL.
Find out more: The Edinburgh Geologist – Issue no 38 (pdf file)
The Tri-Centenary of Hutton’s birth in 2026.
The Edinburgh Geological Society will be marking this occasion by holding a series of events.