WordNet (r) 3.0 (2006):

crop out
    v 1: appear at the surface; "A seam of coal bassets" [syn:
         basset, crop out]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "crop out":
   appear, arise, be conspicuous, be exposed, become manifest,
   become visible, come, come forth, come forward, come in sight,
   come out, come to hand, come to light, emerge, enter, fade in,
   hang out, have high visibility, heave in sight, issue, issue forth,
   look forth, loom, materialize, outcrop, peep out, rear its head,
   rise, see the light, show, show up, stick out, stream forth,
   strike the eye, turn up