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Unformatted text preview: o 1. Non-deposition: no material is being deposited o 2. Erosion: mater is deposited and then removed. Unconformity: a place in a sequence of rocks that marks the ABSENCE of part of the rock record Significant time is NOT represented Like an incomplete calendar We WILL discuss reasons today or Monday Three Important Types of Unconformity 1. Nonconformity 2. Angular unconformity 3. Disconformity Nonconformity Sedimentary rocks overlie igneous or metamorphic rocks Usually obvious erosion surface Angular unconformity Deformed (tilted) rocks are overlain by undeformed rocks Disconformity Parallel layers of sedimentary rock with an obvious erosion surface between...
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- Spring '07
- igneous intrusive rocks, Nonconformity Sedimentary rocks