a narrow opening resulting from a split or crack as in a cliff
a long narrow depression in a surface
A crack or narrow fissure in bedrock which tends to accumulate and trap gold. Small cracks can hold large quantities of gold, and are usually the best prospects for the gold panner.
A split, crack, or open fissure in the bedrock surface. Those crevices that are likely to trap gold out of the material as it passed over during a large storm.