File:Geological cliffs - geograph.org.uk - 1417036.jpg
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English: Geological cliffs The thick bottom bed is Cretaceous chalk, formed in the ocean through calcium carbonate 'tests' of microfossils. It also contains echinoids, belemnites, bivalves and brachiopods. The chalk is Campanian in age (this period was within the Cretaceous period) and formed 71 to 83 million years ago when Britain was further south and had much nicer weather! Geologists know this because of echinoid Echinocorys Scutata which is a good Zone fossil. A Zone fossil is a species that can show the age of rock, so an organism that lives for 200 million years is rubbish compared to one that lives for 3 million for example.
The area above the chalk is the Wroxham crag (or Weybourne crag as known here). It is made up of earthy materials and contains lots of shells as well as derived fossils from the chalk. The Pastonian and Pre-Pastonian stage (of the early Pleioscene 800 to 1.3 MYA) has thickly bedded shell deposits and contains quartzite and is very similar to the Norwich crag. Deer and other mammals can be found here too, above, the crag is glacial deposits. |
| Date | |
| Source | From geograph.org.uk |
| Author | Ashley Dace |
| Attribution (required by the license) | Ashley Dace / Geological cliffs / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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| Object location | | View this and other nearby images on: OpenStreetMap | |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Ashley Dace and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Ashley Dace
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 15:53, 1 March 2011 | | 640 × 480 (82 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Geological cliffs The thick bottom bed is Cretaceous chalk, formed in the ocean through calcium carbonate 'tests' of microfossils. It also contains echinoids, belemnites, bivalves and brachiopods. |
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