outcrop

Short definition from Wiktionary

Noun

1. 1
   A piece of land that stands out (usually into water) from the land surrounding.
2. 2
   A coming out of bedrock or of an unconsolidated deposit to the surface of the ground.
3. 3
   The part of a rock formation that appears at the surface of the ground.

Verb

1. 1
   To come out to the surface of the ground.