chalk

Chalk Cliff at Hunstanton
  • Location: Hunstanton, North Norfolk coast.
  • Date Taken (dd-mm-yy): June 2010

Dramatic colour banded cliffs at Hunstanton.  The dark, orange brown sandstone is overlain by a thinner layer of red chalk which is overlain by a creamy white pure chalk.  These are all Cretaceous in age.

Bioerosion of chalk
  • Location: Seaford, Sussex, UK
  • Date Taken (dd-mm-yy): February 2008

As well as the more usual wind and water, the Limpets are also eroding the chalk. 

Cretaceous chalk cliffs in Southern England
  • Location: Seaford, Sussex, UK
  • Date Taken (dd-mm-yy): February 2008

The South East coast of England is dominated by chalk cliffs like these.

Nodular flint bands in Cretateous Upper chalk
  • Location: Seaford, Sussex, UK
  • Date Taken (dd-mm-yy): February 2008

Nodular bands of flint in the chalk in Upper Cretaceous chalk.

Tabular Flint Seams
  • Location: Seaford Sussex UK
  • Date Taken (dd-mm-yy): February 2008

Tabular flint in chalk.

Flint nodule containing sponge
  • Location: Seaford, Sussex, UK
  • Date Taken (dd-mm-yy): February 2008

Although it may look like a brachiopod this is a sponge. Many flint nodules form around sponges in this Cretaceous chalk. The organic material in the sponge forms a "focal" point for silica to migrate to during diagenesis. The structure of the sponge can be seen close up. This nodule is about 25 mm across.

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