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An area or formation of older rocks completely surrounded by younger layers.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) an outcrop of rocks that is entirely surrounded by younger rocks
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
The Projects lie along the prolific Senegal-Mali shear zone, within the Kofi Series of the Kedougou-Kenieba Birimian inlier. This inlier hosts the multi-million ounce Sadiola mine and former Yatela mine, each located approximately 20km and 50km to the northwest of the Projects respectively.
|South Wales Geologists Association's next field meeting will be at the Usk Inlier with Lesley Cherns on Saturday, June 15.
Isa inlier. It is envisaged that an open pit copper-gold mine and 7m tonnes per annum concentrator will be developed.
Geochemistry and petrogenesis of Ordovician arc-related mafic volcanic rocks in the Popelogan Inlier, northern New Brunswick.
An F will be computed by those outlierfree seeds and will produce small residual errors in [absolute value of [p.sub.a]F[p.sub.b]] for mostly inlier matching pairs.
A close association between fluorite and U has also been reported in some orogenic U deposits, such as in the Mount Isa Inlier, Australia [2].
One-class support vector machine (OCSVM) [10] or support vector data description (SVDD) [11,12], which considers the case that training data are all normal instances, conducts a hypersphere around the normal data and utilizes the constructed hypersphere to detect an unknown sample as an inlier or outlier.
If it fits the criterion of [m.sub.d], the point is treated as just another hypothetical inlier. The minimum percentage of observations that must be the correct data in the whole data set is also defined (for example, the model can be regarded as properly defined if 80 % of the observations are those that are not burdened with outliers).