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Diagram of Unconformity Types

Unconformity Types and Examples

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Here are the four main unconformity types. British geologists classify the disconformity and paraconformity as nonsequences because the rock beds are conformable, that is, parallel. Learn more in this article.
Simple diagrams and explanations

Symbols on the left are for Pennsylvanian age (bottom) and Triassic age (top), separated by at least 50 million years.

Diagram (c) 2011 Andrew Alden, licensed to About.com (fair use policy)
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