Unconformity

Hutton Unconformity at Jedburgh, Scotland, illustrated by John Clerk in 1787 with a recent photography (2003) by Keith Montgomery. The Jedburgh - Newcastle road (A68) is above the section. The section is located about 5 minutes walk from the Jedburgh Abbey, on the outskirts of the town. This is a good example of an "angular unconformity" in which tilted sedimentary beds are overlain by horizontal beds. This unconformity represents a long gap in the record of geological time, during which deposition had ceased and folding or faulting occurred, the lower strata tilted, and then deposition resumed.

Useful links

• Unconformities, angular unconformities, disconformities, etc.
• The Great Unconformity
• CliffsNotes.com
• Wikipedia
• Pictures of unconformities

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