Bedrock crack collecting vs. crevice collecting
Both target tight spaces, but bedrock crack collecting is specifically in-place fractures in bedrock. Crevice collecting can include gaps between blocks, talus, or man-made structures.
Bedrock crack collecting vs. dredging sediment
Dredging disturbs the streambed and can be illegal or harmful. Crack collecting is typically low-impact when you work only what is already exposed.
Bedrock crack collecting vs. aggressive prying
If you have to lever hard to “open” the rock, you are no longer collecting—you are damaging bedrock. Stick to gentle extraction and loose material.