Jisho

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Noun
1. base rock; country rock; gangue; host rock; mother rock; parent rock; wall rock
Wikipedia definition
2. Country rock (geology)Country rock is a geological term meaning the rock native to an area. It is similar and in many cases interchangeable with the terms basement and wall rocks. The term is used to denote the usual strata of a region in relation to the rock which is being discussed or observed.
Read “Country rock (geology)” on English Wikipedia
Read “母岩” on Japanese Wikipedia
Read “Country rock (geology)” on DBpedia

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