At the end of the last ice age, a river formed from glacial meltwater flowed overland to the sea. A chalk cliff face is at the back of the cove. If you’ve found the resources on this site useful please consider making a secure donation via PayPal to support the development of the site. Because there’s no erosion, there is no material to replenish the beach meaning the beach level will become lower. Folding at Lulworth Cove. The harder Portland Beds form the layer that is the closest to the sea as show in the diagram above.
But, by stopping the movement of beach material along the coast beaches further down the coast are becoming narrower and subject to more erosion due to reduced ability to absorb wave energy. This is made of chalk which is a harder rock. The area is extremely important for its geology, with some of the finest folding strata in Europe” BBC, Sediment has been deposited over time to form a spit. Towards the northern end of the bay the cliffs are covered in vegetation, stablising them and protecting them from erosion. This process limits the energy of the waves, therefore creating a calm environment which is popular with tourists who use the beach and for fishing boats in the cove. The headland juts out into the sea, so it is more vulnerable to high-energy waves.
Groynes Levvel are wooden or stone barries which are built at right angles to the coast. Behind the spit there is The Fleet, a lagoon. A concordant coastline has the same type of rock along its length. Take a look at our new resources lulworty the shop Dismiss. The area is extremely important for its geology, with some of the finest folding strata in Europe” BBC, The limestone cliffs forming the back wall of the cove are vulnerable to mass movement and sometimes experience small slides and slumps.
Durdle Door Fact file: Coastlines where the geology alternates between bands of hard and soft rock which are perpendicular to the shore xtudy called discordant coastlines. Sorry, your blog cannot share posts by email.
It has been created by longshore drift. Skip to main content.
The river cut a valley and breached the portland stone. This means waves are slowed, reducing erosion and will help to protect proprties and cliffs.
In Lulworth they are no longer like this. A hard rock type is resistant to erosion and creates a promontory whilst a softer rock type is easily geoyraphy creating a bay.
Dorset – case study of a UK coastal landscape
The structures of rock run parallel to the coastline. Sometimes the outer hard rock is punctured allowing the sea to erode the softer rocks behind. Landforms of the South Coast. They now lie with the oldest rock, the Portland Stone, nearest the sea and the youngest stone, chalk, furthest inland.
Concrete sea walls are in place along most of Swanage beach. Then the cove widens where the softer clays have been more lulwoeth eroded.
An arch at the end of the headland has collpased to form a stack called Old Harry and a stump called Old Harry’s Wife. A concordant coastline occurs where the bands of differing rock types run parallel to the coast. The spit has continued to join to the Isle of Portland. Towards the northern sttudy of the bay the cliffs are covered in vegetation, stablising them and protecting them from erosion.
The rising sea flooded the valley and further eroded the cliffs to form the cove.
The entrance to the cove is narrow where the waves have cut through weaknesses in the resistant limestone. Discordant coastline occurs where bands of differing rock type run perpendicular to the coast. The arch is gradually being worn away by mechanical, chemical and biological weathering. This caused the formation of Old Harry, a stack.
Lulworth cove – Example case – Revision Notes in GCSE Geography
It is unusual as it has formed parallel to the coastline. The soft rock is made of clay and sands, and the hard rock is chalk and limestone.
Elsewhere, the cliffs are not covered by vegetation, so wet weather weakens them causing slumps. Each year more than Casse Portland limestone is resistant to erosion; then to the north there is Swanage Bay where the rock type is a softer greensand.