country rock

plural country rocks

1. uncountableentertainmentA genre of music combining elements of country music and rock music.
2. countablegeographyThe rock which is native to a certain area.

   It is commonly said of manganese ores that in their occurrence they are generally of a pockety nature, by which it is meant that the ores are found in limited masses surrounded by unproductive country rock, as opposed to the usual occurrence of other minerals in veins […]

   1901, Charles Willard Hayes, Thomas Wayland Vaughan, Arthur Coe Spencer, Report on a Geological Reconnoissance of Cuba, page 63

3. countablebusinessRock that surrounds reefs or lodes of mined minerals, forming the walls and floors of quarries, or through which mine tunnels are driven.

   After driving, and opening the reef for some distance, it turned under, and completely pinched out in country rock.

   1912 Queensland Annual Report of the Under Secretary for Mines for 1911. Brisbane, Australia. p. 69