Geography Geology and rock structure
- Created by: jodie.g
- Created on: 23-05-18 19:38
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- Geology and rock structure on the Dorset coast
- Hard rocks/soft rocks affecting landform
- Hard rocks are less easily eroded than soft rocks so they project into the sea as headlands and form high cliffs
- In the Isle of Purbeck, the hard Portland limestone forms steep cliffs, while the softer sandstone form low-lying bays
- Hard chalk rocks have produced arches and stacks
- Rock structures affecting landforms
- Rock structure: How rocks are aligned in relation to the coast (concordant, discordant) + how rocks dip down to the sea due to folding
- Concordant/ discordant coasts
- Along the east cost of Purbeck, layers of soft and hard rock run at right angles to the shore
- Along the southern coast of Purbeck, the shape is very smooth where rock is uniform.
- Rock's angle of dip
- Sedimentary rocks are formed on the sea bed and raised by mountain building processes
- The rising angle of dip at the coast results in a steep cliff profile
- Major landforms of the Dorset coast
- Durdle Door (arch)
- Lulworth (cove)
- Kimmeridge (wave cut platforms)
- Seacombe (cliffs)
- Durlston Head (headland/cliff)
- Hard rocks/soft rocks affecting landform
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