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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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The angular unconformity at Jedburgh, UK, first described by James Hutton, is then used to introduce concepts of time within the sedimentary record.
The Sedimentary Record of Sea-Level Change by Long, Darrel G.F. / Geoscience Canada
Abstract: The Warrensburg Sandstone, a Pennsylvanian alluvial valley-fill in Johnson County, Missouri, lies with angular unconformity on Desmoinesian Pennsylvanian marine strata comprised mainly of shales and thin limestones.
Valley anticline associated with the Warrensburg Sandstone in Missouri by Nold, John L. / Transactions of the Missouri Academy of Science
The growing portfolio of prospects includes large anticlinal structures, angular unconformity pinch-outs, and turbidite fans within the Upper Cretaceous section.
BOS to Provide Extensive 3-D Seismic Surveys Offshore Guinea as ... by Business Wire
 
 
 
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