BLAKENEY ESKER What is it and how did it form?

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Presentation transcript:

BLAKENEY ESKER What is it and how did it form? Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. Photo source: www.hi.is/~oi/

What is Blakeney Esker? 3.5 km long ridge, up to 20 m high Morston to Glandford, N Norfolk Consists of sand and gravel Quarried from WWII to early 1990s Glacial origins Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2005, AM Jarrow

Internal composition Unit A chalky till till is laid down by glacier ice - made of a mixture of gravel, sand, silt and clay material is picked up by glacier as it moves over the landscape giving geologists an idea of which direction the ice has moved in Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”.

Internal composition Unit B sand and gravel forms the ridge gravel is mostly flint occasional lens of till (Unit A) pockets of yellowish orange sand round gravels due to erosion deposited in a high-energy system © NERC 2006, P Witney Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”.

How did it form? - 1 Ice advance - deposition of chalky till Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2006, JR Lee. Modified from Gray, 1997

How did it form? - 2 Erosion of the Nye channels Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2006, JR Lee. Modified from Gray, 1997

How did it form? - 3 Infilling of Nye channels with sand and gravel Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2006, JR Lee. Modified from Gray, 1997

How did it form? - 4 Infilling of large tunnel at base of ice Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2006, JR Lee. Modified from Gray, 1997

How did it form? – 4a Photo showing an esker forming in this way… Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2005, T Bradwell

How did it form? - 5 Deglaciation – removal of ice Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2006, JR Lee. Modified from Gray, 1997

Blakeney Esker today Please refer to the Microsoft Word and Adobe PDF documents available on the website for the further information required to present this PowerPoint presentation. The information in this presentation refers to the text in the document called “Blakeney Esker”. © NERC 2006, P Witney

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