Uniformitarianism
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Uniformitarianism, also known as the Doctrine of Uniformity or the Uniformitarian Principle, is the assumption that the same natural laws and processes that operate in our present-day scientific obser
Hutton's Unconformity at Jedburgh. Above: John Clerk of Eldin's 1787 illustration. Below: 2003 photograph.
Cliff at the east of Siccar Point in Berwickshire, showing the gently tilting red sandstone layers above vertically tilted greywacke rocks
Charles Lyell at the British Association meeting in Glasgow 1840
Hutton's Unconformity
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Hutton's Unconformity is a name given to various notable geological sites in Scotland identified by the 18th-century Scottish geologist James Hutton as places where the junction between two types of r
Uniformitarianism
…presumed primordial rock had been molten after the strata had formed. He had read about angular unconformities as interpreted by Neptunists, and found an unconformity at Jedburgh where layers of greywacke in the lower layers of the cliff face have been tilted almost vertically before being eroded to form a level…
Cover of the journal Transactions of the Royal Society of Edinburgh. This is the issue where James Hutton published his Theory of the Earth in 1788.
Hutton's Glen Tilt exposure at the collapsed Dail-an-eas Bridge upstream from Forest Lodge, drawn by John Clerk of Eldin in 1785; N 56.85109, W 3.74187
Hutton’s First Unconformity at Newton Shore on the Island of Arran; N 55.718072, -5.287987