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Home / Landscape & Geology / Dorset Coast and Geology / Lulworth Area - Formation of Durdle Door Arch / Durdle Door coastline (formation) -Picture 1: The coastline today
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The exposed rocks in the area around Lulworth cove are made up of principally of 5 different types of sedimentary rocks (Chalk, Greensand, Wealden Bed, Purbeck Beds, Portland stone), formed between 65 and 150 million years ago. Durdle door is a bastion of Portland and Purbeck Limestone. At one ti...

Durdle Door coastline (formation) -Picture 1: The coastline today

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The exposed rocks in the area around Lulworth cove are made up of principally of 5 different types of sedimentary rocks (Chalk, Greensand, Wealden Bed, Purbeck Beds, Portland stone), formed between 65 and 150 million years ago. Durdle door is a bastion of Portland and Purbeck Limestone. At one time the Purbeck and Portland rocks extended along the coastline. However the sea exploited weaknesses or faults in the rocks and erosion has seen the limestone eroded away either side of Durdle Door exposing the softer rocks behind.

Added:
8th Dec 2005 by Diane Earl

Subjects:
 Geography, Science

Key Stages:
 Key Stage 3, Key Stage 4, Key Stage 4+

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