out·crop 
(outkrŏp′)
(outkrŏp′)n. or out·crop·ping (outkrŏp′ĭng)
A portion of bedrock or other stratum protruding through the soil level.
intr.v. (out-krŏp) out·cropped, out·crop·ping, out·crops
To protrude above the soil, as rock formations.
[OUT + CROP, to appear on the surface.]