The frequency with which certain simple motifs appear in these oldest sites has led rock-art researchers to adopt a descriptive term—the Panaramitee style—a label which takes its name from the extensive rock pavements at Panaramitee North in desert South Australia, which are covered with motifs pecked into the surface.
主干：The frequency has led sb to do sth
定语从句还原：
Certain simple motifs appear in these oldest sites WITH FREQUENCY.
The label takes its name from the rock pavements.
The rock pavements are covered with motifs pecked into the surface.
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