The Archby Chris' Landscape Images & Designs
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On coasts two different types of arches can form depending on the geology. On discordant coastlines rock types run at 90° to the coast. Wave refraction concentrates the wave energy on the headland, and an arch forms when caves break through the headland, e.g., London Bridge in (Victoria, Australia). When these eventually collapse, they form stacks and stumps.
On concordant coastlines rock types run parallel to the coastline, with weak rock (such as shale) protected by stronger rock (such as limestone) the wave action breaks through the strong rock and then erodes the weak rock very quickly. Good examples of this are at Durdle Door and Stair Hole near Lulworth Cove on the Dorset Jurassic Coast in south England, although these are on an area of concordant coastline. When Stair Hole eventually collapses, it will form a cove.
This unique rock formation has been created by constant erosion of the limestone cliffs of the Australian mainland that began 10–20 million years ago. The stormy Southern Ocean and constant blasting winds gradually eroded the softer limestone, forming caves and sheer cliffs. The caves eventually became arches and when they collapsed rock stacks up to 45 metres high were left isolated from the shore.
Victoria - Australia
*Canon EOS "KISS" D/SLR Camera.
1/160, 18mm, F/8, ISO 100