The Future Of Durdle Door

On the 8th March 2017, the unthinkable happened to one of Malta's most iconic natural monuments. The Azure Window, a natural limestone coastal arch, which formed the backdrop for scenes in Clash of the Titans, the Count of Monte Cristo and Game of Thrones collapsed after a violent storm.

The Prime Minister, Joseph Muscat said the news was heartbreaking and he commented that “reports commissioned over the years indicated that the landmark would be hard hit by unavoidable natural corrosion. From a geomorphologist's perspective, 'natural corrosion' and indeed weathering are part and parcel of why beautiful coastlines and features like this exist all over the world.

Our very own and much loved coastal arch, Durdle Door, itself has become a famous in its own right featuring in a multitude of Hollywood and Bollywood films. The Azure Window in Malta, before and after its collapse. Durdle Door is a textbook example of a natural coastal arch which is located to the west of Lulworth Cove on the Dorset coast. The feature was probably named more than a 1000 years ago which reflects how slowly change happens on some parts of the coast.

The name "Durdle" is derived from an Old English word "thirl", meaning to pierce (as in "nostril"). This stunning coastal arch is the product of natural erosion processes interacting with the local geology.   The rock layers here have been tilted and shifted so that the oldest rocks in the sequence (Portland Stone) have been pushed up so they face the sea.

You can see this very clearly at Stair Hole; a dramatic visual expression of powerful tectonic forces crumpling the rock like they were pieces of paper. Equally fascinating is how the nature of the rocks at this location has defined the beauty of the landscape. Behind the resistant limestone layer of Portland Stone, are sequences of (weaker) clay, sandstone and then finally a strong headwall of chalk. Over time, the waves have broken through the resistant wall of limestone, carving into the weaker sands and clays to create a beautiful horseshoe shaped cove.   The stunning crumpled layers of rock at Stair Hole.