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Country rock (geology)
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In geology, country rock is the rock native to an area, in contrast to any intrusion of viscous geologic material, commonly magma, or perhaps rock salt (in salt domes) or unconsolidated sediments.[1]
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Magma is typically less dense than the rock it intrudes, widening and filling existing cracks, sometimes melting the already-existing country rock.[2]
The term "country rock" is similar to, and in many cases interchangeable with, the terms basement and wall rocks.
Country rock can denote the widespread lithology of a region in relation to the rock which is being discussed or observed.
- ^ "Country rock - encyclopedia.com". encyclopedia.com. Retrieved 16 December 2018.
- ^ Earle, Steven (September 2015). "3.5 Intrusive Igneous Bodies". 3.5 Intrusive Igneous Bodies. Retrieved 16 December 2018.
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