In the spring of 1788, James Hutton peered from his small boat at the cliffs of Siccar Point in SE Scotland and, seeing horizontal red sandstones lying directly upon vertical beds, became the first to perceive the long time interval implied by this kind of junction. The underlying material had to have been buried, lithified, rotated, and uplifted before the red sandstones were deposited on it.
KeywordsVersus Versus Versus Lower Jurassic Angular Unconformity Young Rock Geometrical Discordance
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Selected further reading
- Roberts, J. L. (1982). Introduction to geological maps and structures, Oxford, Pergamon Press. (Chapter 7 contains a detailed discussion of the use of unconformity and related terms.)Google Scholar