Lulworth Cove, Dorset - Durdle Door, sunset - postcard c.1980s

Postcard
• Picture / Image:  Winter Sunset, Durdle Door, near Lulworth Cove, Dorset
• Publisher:  'distributed by SCA'
• Postally used:  no
• Stamp:  n/a
• Postmark(s):  n/a
• Sent to:  n/a
• Notes / condition: 

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information (internal links may not  work) :

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Durdle Door is a natural limestone arch on the Jurassic Coast near Lulworth in Dorset, England.^[1] It is privately owned by the Welds, a family who own 12,000 acres (50 km²) in Dorset in the name of the Lulworth Estate.^[2] It is open to the public. The name Durdle is derived from the Old English 'thirl' meaning bore or drill.

The arch has formed on a concordant coastline where bands of rock run parallel to the shoreline.^{[citation needed]} The rock strata are almost vertical, and the bands of rock are quite narrow. Originally a band of resistant Portland limestone ran along the shore, the same band appears one mile along the coast forming the narrow entrance to Lulworth Cove. Behind this is a 120-metre (390 ft) band of weaker, easily eroded rocks, and behind this is a stronger and much thicker band of chalk, which forms the Purbeck Hills.

The limestone and chalk are in closer proximity at Durdle Door than at Swanage, 10 miles (16 km) to the east, where the distance is over 2 miles (3 km).^{[citation needed]} There are at least three reasons for this. Firstly, the beds are highly inclined (whilst more gently inclined at Swanage). Secondly, some of the beds have been cut out by faulting; and thirdly, the area around Durdle Door seems unusually shallow, so thinner bands of sediments were deposited. At Durdle Bay nearly all of the limestone has been removed by sea erosion, whilst the remainder forms a small headland. Erosion at the western end of the limestone band has resulted in the arch formation. UNESCO teams have been working on saving both the arch and adjacent beach.^{[citation needed]}

The 120-metre (390 ft) isthmus which joins the limestone to the chalk is made of a 50-metre (160 ft) band of Portland limestone, which is less resistant than the Purbeck beds, a narrow and compressed band of Cretaceous clays — Wealden Clay, sands and chert beds — and then narrow bands of Greensand and sandstone.^{[citation needed]} In Man of War Bay, the small bay immediately east of Durdle Door the Portland stone has not been entirely eroded away, and at low tide the band of Portland stone is partially revealed.

type=printed postcards

theme=topographical: british

sub-theme=england

county/ country=dorset

number of items=single

period=1945 - present

postage condition=unposted