Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology The original precursor of any specified metamorphic rock

Etymologies

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Examples

  • Intriguingly, Squyres pointed out, neither the surface composition nor the interior composition was a "perfect match" to the "protolith" for the Meridiani sediments.

    Planetary Society Daily Almanac 2010

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