Noughts & crosses at Kimmeridge Bay

Pattern of ovoid cracks (1) in rocks on the seashore at Kimmeridge Bay, Dorset, U.K. on the Jurassic Coast World Heritage Site 

Continuing the theme of patterns that decorate the rocks at Kimmeridge Bay, the circular and ovoid fractures seen here in large detached boulders on the shore made me think of noughts and crosses. They obviously result from some entirely different processes to those that produce the large and small polygons in the rock ledges.

Pattern of circular and ovoid cracks (2) in dolomitic rocks on the seashore at Kimmeridge Bay, Dorset, U.K. on the Jurassic Coast World Heritage Site 

There are fossil ammonites in these boulders as well as the fracture patterns.

Cross or star-shaped crack (3) in the dolomite rock pavement or platform at Kimmeridge Bay, Dorset, UK on the Jurassic Coast World Heritage Site. 

Cross or star shape at the junction of several fissures in the rock layer above. And below some slightly different sub-circular fracture patterns within a layer that additionally has polygonal cracks and fissures.

Circular fracture patterns (4) on the surface of dolomite rock at Kimmeridge Bay, Dorset, UK on the Jurassic Coast World Heritage Site 

For more information about Kimmeridge Bay see the Purbeck Marine Wildlife Reserve Web Site.

For detailed information about the geology of Kimmeridge Bay see the most excellent academic guide written by Ian West of the National Oceanography Centre in Southampton University.
 
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3 thoughts on “Noughts & crosses at Kimmeridge Bay

  1. Pingback: Posts about ROCKS & FOSSILS « Jessica’s Nature Blog

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