| 词条 | Haffield Breccia |
| 释义 |
Haffield Breccia, or Clent Breccia, (now known as the Haffield and Clent Formations) [1] consist of a texturally immature compacted gravel, rich in volcanic clasts with some sedimentary rocks, in a sandy or muddy matrix, which outcrops in the English Midlands, in South Staffordshire, Birmingham and the Malverns. It is thought to have been deposited by during flash floods in rivers that were flowing through a desert, somewhere between 200 and 280 million years ago during the Permian period. The gravel consists of angular fragments, showing that they have not been transported over long distances.[2][3][4][5]See also
References1. ^{{cite web|author=BGS staff |url=http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=CLHB|title=The BGS Lexicon of Named Rock Units — Result Details: Clent Formation and Haffield Breccia Formation (undifferentiated) |publisher=British Geological Survey|accessdate=8 October 2016}} 2. ^{{cite web |url=http://www.earthheritagetrust.org/pub/category/our-earth-heritage/local-landscapes/ |title=The Teme Valley |website=www.earthheritagetrust.org| publisher=Herefordshire and Worcestershire Earth Heritage Trust |accessdate=8 October 2016}} 3. ^{{cite web|author=WCC staff |url=http://www.worcestershire.gov.uk/downloads/file/5086/waseley_hills_country_park_guide |title=Guide to Waseley Hills Country Park |publisher=Worcestershire County Council |page=3 |accessdate=8 October 2016}} 4. ^{{cite web|author=Bromsgrove District Council |url=http://www.english-nature.org.uk/citation/citation_photo/1002956.pdf |title=Sling Gravel Pits |publisher=Hereford & Worcester Council|page=1 |accessdate=8 October 2016}} 5. ^{{cite web|url=https://www.birmingham.gov.uk/info/20089/parks/406/lickey_hills_country_park/5 |title=Lickey Hills Country Park - Geology |publisher=Birmingham City council |accessdate=8 October 2016}} Further reading
2 : Permian System of Europe|Geologic formations of the United Kingdom |
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