...). At Boddentown (Fig. 1) samples were collected from a submerged, arcuate, seaward ipping rock sheet located about 20 m offshore in water l0 to 50 cms deep (Fig. 2A). It parallels an arcuate sheet ofbeachrock that is exposed in a more landward position (Fig. 2A). The setting at Colliers Bay is identical (Fig. 2B...