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Bradford clay (W3)
Engl. "Bradford clay", dt. "Bradford-Thon", wurde von J. de. C. Sowerby im Jahr 1823 nach dem Ort Bradford-on-Avon in Wiltshire, England, benannt.
(E2)(L1) http://web.archive.org/web/20120331173214/http://www.1911encyclopedia.org/Bradford clay
BRADFORD CLAY, in geology, a thin, rather inconstant bed of clay or marl situated in England at the base of the Forest Marble, the two together constituting the Bradfordian group in the Bathonian series of Jurassic rocks. The term "Bradford Clay" appears to have been first used by J. de. C. Sowerby in 1823 (Mineral Conchology, vol. v.) as an alternative for W. Smith's "Clay on Upper Oolite." The clay came into notice late in the 18th century on account of the local abundance of the crinoid Apiocrinus Parkinsoni. It takes its name from Bradford-on-Avon in Wiltshire, whence it is traceable southward to the Dorset coast and northward towards Cirencester.
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(E1)(L1) http://books.google.com/ngrams/graph?corpus=0&content=Bradford clay
Abfrage im Google-Corpus mit 15Mio. eingescannter Bücher von 1500 bis heute.
Engl. "Bradford clay" taucht in der Literatur um das Jahr 1820 auf.
Erstellt: 2012-02