Ecological aspects of two wood-boring molluscs from the continental terrace off Oregon. . ecologicalaspect00tipp Year: 1968 OAK ▲. ^,^f^r\ A 200 400 600 800 Depf/t of exposure (meters) 1000 Figure 39. Average depth of maxlniam penetration versus depth of exposure for 30 days. 8 I- <: 5 2- .CEDAR -«^^_^ -^ '''—• —It.' ''''• - ---A 200 400 600 800 1000 Depth of exposure (meters) Figure 40. Average depth of maximum penetration versus depth of exposure for 60 days.

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