Coastal LandformsCoastal Landforms

Erosional Features

Cliff and Wave-cut Platform

Active wave erosion between the high water mark and low water markNotch

Cliff and Wave-cut platform

Basal undercutting;notch enlarge

Rock above notch collapse

Cliff retreats

Cliff

Cliff retreats

Wave-cut platform enlarges

Cliff and Wave-cut platform

Wave-built terrace

Sea cave, blow hole and geo

Active erosion

Line of weakness

Sea cave, blow hole and geo

Sea caveat the base of the cliff

Sea cave

Cliff

Sea cave, blow hole and geo

Lines of weakness

Sea caveenlarges

Hydraulic action continues

Sea cave, blow hole and geo

Blow hole

Sea cave

Blow hole

Sea cave

A tunnel is formed

Sea cave, blow hole and geo

Roof of cave collapses

Geo (a steep-sided narrow inlet)

Sea cave, sea arch and sea stack

Line of weakness

CavesCaves

Sea cave, sea arch and sea stack

ArchA tunnel formed

Sea cave, sea arch and sea stack

Arch collapsesSea stack

Arch collapses