Granite is frequently the country rock in which tin is found.
The immediate effect must have been to give both intruded rock and country rock greater height and marked ruggedness.
"Country Rock at Kish-Kish" was built on a newspaper clipping twenty years old.
One got knocked out entirely for a minute, by a nice piece of country rock in the head.
The country rock lying immediately above the reef is the “hanging wall,” and that immediately below, the “foot wall.”
A thick-waisted chimney of country rock buttressed the long side-wall of peeled logs chinked with mud.
The tin "wash" in question may also contain gold, as the country rock of the neighbourhood is such as gold is usually found in.
In many places the upper surface of the country rock beneath the drift has been swept clean of residual clays and other waste.
I've been grub-stakin' Jacks for two or three years, and he ain't never yet found anythin' but country rock.
She found that the country rock of his reserve hid unsuspected veins of tenderness, of poesy and of melancholy.