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stylolite

[stahy-luh-lahyt]
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noun Geology.
  1. an irregular columnar structure in certain limestones, the columns being approximately at right angles to the bedding planes.
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Origin of stylolite

First recorded in 1865–70; stylo-2 + -lite
Related formssty·lo·lit·ic [stahy-luh-lit-ik] /ˌstaɪ ləˈlɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for stylolite

stylolite

noun
  1. any of the small striated columnar or irregular structures within the strata of some limestones
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Derived Formsstylolitic (ˌstaɪləˈlɪtɪk), adjective

Word Origin

C19: from Greek stulos pillar + -lite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

stylolite in Science

stylolite

[stīlə-līt′]
  1. A contact surface usually found between two calcareous rock layers, marked by a series of jagged interlocking up-and-down projections that resemble a suture or the tracing of a stylus. Stylolites are found in rocks that have been subjected to pressure and are formed by a process, called pressure dissolution, whereby insoluble material, such as clay and hydrocarbons, becomes concentrated along a surface while other more soluble material, such as calcite, is carried away.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.