Geology of Wave Cut Platforms

Study Notes

Wave Cut Platforms

Formed when the sea attacks the cliff base between high and low tide marks.
A wave cut notch is created by processes such as abrasion and hydraulic action, resulting in a dent at high tide level.
As the notch enlarges, the cliff loses stability and collapses, causing retreat.
Eroded materials are removed by backwash, leaving behind a wave cut platform.
The cycle continues, perpetuating cliff retreat.

Example of Wave Cut Platform

Located at Southern Down, South Wales, UK.

Discordant Coastline

Characterized by alternating bands of hard and soft rock in its geology.

Concordant Coastline

Contains a uniform type of rock along its length.
Typically features fewer bays and headlands compared to discordant coastlines.

Headland

Defined as a narrow segment of land that extends into the sea from the coastline.

Bay

Described as a broad inlet where land curves inward along the coast.

Formation of Headlands and Bays

Soft rocks, like clay or sand, erode quickly, leading to the formation of bays.
Hard rocks, such as chalk, resist erosion; as softer rocks erode, hard rock protrudes, forming headlands.

Conditions for Headland and Bay Formation

Occur when different rock types along a coastline erode at different rates.

Features Found on Headlands

Caves, arches, stacks, and stumps are commonly found on headlands.

Formation of Caves, Arches, Stacks, and Stumps

Initial widening of cracks in headlands occurs due to hydraulic action and abrasion.
Continued wave action enlarges these cracks into caves.
Caves can become large enough to break through the headland, forming an arch.
Erosion at the arch base causes the roof to collapse, creating a stack.
The stack is gradually undercut until it collapses to form a stump.

Description

Explore the fascinating processes behind wave cut platforms and their formation along the coastline. Learn about the effects of erosion, the differences between discordant and concordant coastlines, and features like headlands and bays. This quiz delves into the dynamic relationship between the sea and coastal landforms.