The Collaborative International Dictionary of English v.0.48:

Gravelly \Grav"el*ly\, a.
   Abounding with gravel; consisting of gravel; as, a gravelly
   soil.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gravelly
    adj 1: abounding in small stones; "landed at a shingly little
           beach" [syn: gravelly, pebbly, shingly]
    2: unpleasantly harsh or grating in sound; "a gravelly voice"
       [syn: grating, gravelly, rasping, raspy, rough,
       scratchy]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "gravelly":
   arenaceous, arenarious, breccial, brecciated, corrugated, cragged,
   craggy, crinkled, crumpled, crystal, crystalline, grainy, granular,
   granulate, granulated, gritty, harsh, ironbound, jagged, jaggy,
   lapideous, lithoid, lithoidal, monolithic, pebbled, pebbly,
   porphyritic, ragged, rock-ribbed, rock-strewn, rock-studded,
   rockbound, rocklike, rocky, rugged, rugose, rugous, sabulous,
   sandy, saw-toothed, sawtooth, scragged, scraggly, scraggy, serrate,
   serrated, shingled, shingly, snagged, snaggled, snaggy, stonelike,
   stony, trachytic, wrinkled