Discordant & Concordant Coastlines
Geography: Cambridge International GCSE (2027 Exams), topic 2.2.6
Main Landforms of Discordant and Concordant Coastlines
The formation of discordant and concordant coastlines results in different landforms based on rock type orientation and erosion processes.
Discordant coastlines
- Discordant coastlines occur where bands of hard and soft rock run perpendicular to the coast.
- Softer rocks erode faster, forming bays.
- Harder rocks resist erosion, creating headlands that project into the sea.
- This contrast shapes jagged coastlines with clear landforms.
Landforms of discordant coastlines
- Bays form where soft rock erodes quickly, making wide, sheltered inlets.
- Headlands are steep, rocky areas of hard rock standing out from the coast.
- Cliffs and wave-cut platforms often develop at headlands.
- Wave refraction causes erosion to concentrate on headlands.
Concordant coastlines
- Concordant coastlines have rock strata running parallel to the coast.
- The sea erodes outer hard rock layers first.
- Softer rock layers behind may form coves or inlets once exposed.
- This process often creates smoother, more uniform coastlines.
Landforms of concordant coastlines
- Coves develop where the sea breaks through hard outer rock to erode softer rock inside.
- Coves are typically circular or oval, with narrow entrances.
- The cove formation creates sheltered, calm water areas.
- Hard rock layers protect most of the coast, limiting wider erosion.
,w_800.jpg)
Comparing types of coastlines
- Discordant coastlines create alternating headlands and bays due to varying rock resistance.
- Concordant coastlines feature fewer indentations with coves formed behind hard layers.
- Wave energy dissipates differently on each.
- This knowledge helps explain coastal shape and erosion patterns.
Test yourself on Discordant & Concordant Coastlines
In a concordant coastline, the sea first erodes which rock layer?
Which statement best describes the difference between concordant and discordant coastlines?