• synonyms


noun Geology.
  1. an outcrop of a formation completely surrounded by rocks of younger age.
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Compare outlier.

Origin of inlier

First recorded in 1855–60; in + (out)lier
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for inlier

Historical Examples of inlier

  • An inlier of these rocks appears in the rising ground east of Dungiven, including dark grey crystalline limestone.

    Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 8


  • Good slates are quarried at Kilmoganny, in the Silurian inlier on the Slievenaman range.

British Dictionary definitions for inlier


  1. an outcrop of rocks that is entirely surrounded by younger rocks
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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