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Chalk and clay

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Usman Memon
Usman Memon

Sedimentary rocks like chalk and clay were formed under the sea and later uplifted. Chalk is found in bands that form large layered deposits in southern and eastern UK, appearing as the White Cliffs of Dover. Clay is a common rock found everywhere that forms low flat vales due to being impermeable with tiny pores that become waterlogged.

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Chalk and clay
Both sedimentary rocks Formed under the sea and uplifted by tectonic activity Chalk – in south and east UK, looks like bands as it forms layers that cover large areas Clay – common rock found everywah
Chalk Clay Physically tough, but not like granite Weak Heavily jointed and porous Tiny pores which become waterlogged. Permeable, lack of rivers and lack of erosion Impermeable Pure limestone CaCO3 Vulnerable to carbonation, freeze- thaw. Forms excarpment – dip slope, scarp slope, dry valley... E.g. White cliffs of Dover, South Downs Forms low flat ground called vales.

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Chalk and clay

  • 2. ï‚žBoth sedimentary rocks ï‚žFormed under the sea and uplifted by tectonic activity ï‚žChalk – in south and east UK, looks like bands as it forms layers that cover large areas ï‚žClay – common rock found everywah
  • 3. Chalk Clay Physically tough, but not like granite Weak Heavily jointed and porous Tiny pores which become waterlogged. Permeable, lack of rivers and lack of erosion Impermeable Pure limestone CaCO3 Vulnerable to carbonation, freeze- thaw. Forms excarpment – dip slope, scarp slope, dry valley... E.g. White cliffs of Dover, South Downs Forms low flat ground called vales.