Geography Geology and rock structure

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  • 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)

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