Often, the rock stratum just below the more resistant shelf
will be of a softer type, meaning that undercutting
due to splashback will occur here to form
a shallow cave-like formation known as a rock shelter
or plunge pool under and behind the waterfall.
Eventually, the outcropping, more resistant cap rock
will collapse under pressure to add blocks of rock
to the base of the waterfall.
These blocks of rock are then broken down
into smaller boulders by attrition
as they collide with each other,
and they also erode the base of the waterfall by abrasion,
creating a deep plunge pool or gorge.
o.i.inkt/grafietstift/olieverf/nietjes op museumkarton
70 x 155 x 35cm
Foto in atelier
collection: Edo en Hanneke van den Assem