SRL for [carve]: Early fishermen used stones to [carve] a long , narrow catchment -LRB- the so-called " pool " -RRB- in the sand , waiting for the tide to carry in fish which they could then easily scoop up .
ARG-0: stones | ARG-1: a long , narrow catchment -LRB- the so-called " pool " -RRB- | ARG-2: in the sand | ARG-M-PRD: waiting for the tide to carry in fish which they could then easily scoop up