Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from The Century Dictionary and Cyclopedia

  • n. In geology, a part of one formation completely surrounded by another that rests upon it: opposed to outlier.

Etymologies

in1 + (out)lier.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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