Unconformity
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An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older
Hutton's Unconformity at Jedburgh, Scotland, illustrated by John Clerk in 1787 and photographed in 2003.
Disconformity
Nonconformity
Angular unconformity
Siccar Point
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Siccar Point is a rocky promontory in the county of Berwickshire on the east coast of Scotland. It is famous in the history of geology for Hutton's Unconformity found in 1788, which James Hutton regar
Unconformity
…The significance of angular unconformity (see below) was shown by James Hutton, who found examples of Hutton's Unconformity at Jedburgh in 1787 and at Siccar Point in Berwickshire in 1788, both in Scotland. The rocks above an unconformity are younger than the rocks beneath (unless the sequence has been overturned…
The point seen from the west
St. Helen's Chapel.
The eroded sandstone outcrop above conglomerate and vertical ribs of greywacke, still much as when sketched in 1788 by Hutton's companion Sir James Hall.
Field sketch of Hutton's Unconformity at Siccar Point, Scotland by Sir James Hall (1788).