inlier

[in-lahy-er]
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noun Geology.

an outcrop of a formation completely surrounded by rocks of younger age.

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. 2019

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British Dictionary definitions for inlier

inlier

noun

an outcrop of rocks that is entirely surrounded by younger rocks
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