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unconformity
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unconformity

Surface of erosion or nondeposition eventually overlain by younger sedimentary rock strata and preserved in the geologic record. A surface where the beds above and below lie at different angles is called an angular unconformity. The boundary between older igneous or metamorphic rocks that are truncated by erosion and later covered by younger sedimentary rocks is called a nonconformity.
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Geochronology and unconformities are also introduced.
The Johnson GEO CENTRE: earth's geological showcase by Blackwood, R. Frank / Geoscience Canada
With Tertiary and Upper Cretaceous shales forming the major source rocks, much of the oil must have leaked across unconformities into geologically older strata.
Libya's Geology by APS Review Gas Market Trends
We also show evidence of unconformities both at the base and at the top of the Kokomo Limestone Member.
Mudcracks, bird's-eye, and anhydrite in intertidal/supratidal late ... by Kilibarda, Zoran; Doffin, Jason / Proceedings of the Indiana Academy of Science
 
 
 
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