On the coast of which English county would you find the natural limestone arch known as 'Durdle Door'?
Durdle Door Durdle Door Durdle Door (sometimes written Durdle Dor) is a natural limestone arch on the Jurassic Coast near Lulworth in Dorset, England. It is privately owned by the Welds, a family who owns in Dorset in the name of the Lulworth Estate. It is open to the public. The name Durdle is derived from the Old English word ‘thirl' meaning bore or drill. The form of the coastline around Durdle Door is controlled by its geology—both by the contrasting hardnesses of the rocks, and by the local patterns of faults and folds. The arch has formed on a concordant coastline
Durdle Door kinked type of geological fold) produced by the building of the Alps during the mid-Cenozoic. The limestone and chalk are in closer proximity at Durdle Door than at Swanage, to the east, where the distance is over . Around this part of the coast nearly all of the limestone has been removed by sea erosion, whilst the remainder forms the small headland which includes the arch. Erosion at the western end of the limestone band has resulted in the arch formation. UNESCO teams monitor the condition of both the arch and adjacent beach. The isthmus which joins the limestone to