aeolian
aleuritic
amazing
architecture
argillaceous slate
cave
clay argillite shale
clay slate
claystone
cliff
cliffs
coastal erosion
cornice collapse
crag
dangerous to shipping
erosion grotto
hole
homogeneous
huge
killas
layer
layered
majestic
monotone structure
monotonous pattern
mountains
natural slate
passage
peel
ply
reef
rock
rock formation
rocks
shale
similar
slate
surf
the arch
the destruction of the shore
the grotto
the waves
weathering
wind erosion