They form as a ledge of bedrock left behind as the dliff retreats. Swanage is located in South England and features both a discordant and concordant coastline (see diagram below) Due to this contrasting geology a number of differences can be outlined. Gradually the material is moved along the coastline, its direction controlled by the prevailing wind direction. A headland. Discordant coastline occurs where bands of differing rock type run perpendicular to the coast.. This differential erosion creates headlands and bays along discordant coastlines. The eroded material piles up in the bay forming a beach. The hard rock shields the soft rock from erosion. Draw a diagram to show how rocks are arranged on a discordant coastline. Discordant coastline – Source www.bbc.co.uk As soft rock, such as glacial till, is more susceptible to erosion it erodes more rapidly than more resistant rock such as chalk. - a discordant coastline, where rocks are at an angle to the edge of the coastline, will erode at different rates. A discordant coastline occurs where bands of different rock type run perpendicular to the coast. A concordant coastline. This could be parallel to the coastline (concordant) or perpendicular to the coastline (discordant). The image to the right shows how the ... diagram above) and the surrounding headlands showing how rock type and structure has influenced the shape of the coastline. Can you work out the type of coastline at point A and point B? Rock structure Massively jointed rocks with large faults are more succeptable to erosion and these are the points on a concordant coastline which will break through allowing the softer rock behind to be eroded to form a cove River channels Pre-existing rivers from the end of … So, bays and headlands occur at discordant coastlines where soft rock has been laid down next to hard rock. The differing resistance to erosion leads to the formation of headlands and bays. The differing resistance to erosion leads to the formation of headlands and bays. The map below shows the Dorset Coast. Pages 74-75 will help. Discordant coastlines form where geology alternates between bands of hard and soft rock (see image below). A bay. beach at right angle to the coastline under the influence of gravity. This diagram and photos will help: How it works. Explain the difference between two geologically contrasting coastlines. The soft rock is eroded more quickly than the hard rock. Coastlines, that are discordant in geology help create typical headland and bay features that also erode over time to form wave-cut platforms and arches and stacks. The headlands remain protruding out further than the bay. On a discordant coastline, alternating layers of hard and soft rock are perpendicular to the coast. Wave cut platforms as illustrated in the diagram and shown in the photograph are remnants of the previous cliff line. Headlands and Bays happen on a discordant coastline. Because the soft rock is exposed, it is eroded faster than the hard rock. A hard rock type is resistant to erosion and creates a promontory whilst a softer rock type is … Some of the coast is a “concordant” coastline, whilst the other part is a “discordant” coastline. B Use the word bank to explain the formation of headlands and bays. Describe and explain how Headlands and Bays form Y11 Coasts - Headlands form along discordant coastlines (bands of hard and soft rock outcrop at right angles *Discordant coastline - A discordant coastline occurs where bands of different rock type run perpendicular to thecoast. This is the location of your Controlled Assessment. Waves attack a discordant coastline*. A .
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