File:Smith fossils2.jpg
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[edit]DescriptionSmith fossils2.jpg |
English: Historical plate showing fossils that characterize the “Clay over the Upper Oolite” of England (more widely known as the Bradford clay, a clayey layer on top of a hardground which forms the basal surface of the Forest Marble Formation in the area of Bradford-on-Avon and is Bathonian, i.e. Middle Jurassic, in age[1]). This plate comes from the fundamental biostratigraphical work of the pioneer of modern geology William Smith. Note that the names of the fossil taxa may have changed since, mainly in a way, that contemporary genus concepts subsequently changed over to family or even higher-ranked taxa. For some of the figured specimens, e.g. for the “Pear Encrinus” in figs. 1–3, there even were no formally described genera or species at the time. This taxon was first mentioned under a linnean binomen only in 1820 by Schlotheim (Encrinites parkinsonii)[2] and was 1821 referred to as Apiocrinites rotundatus by Miller[3]. Because Apiocrinites rotundatus is thus a junior synonym of Encrinites parkinsonii with Encrinites being an in fact meaningless genus from the earliest days of fossil crinoid systematics, the taxon today is referred to as Apiocrinites parkinsoni.[1] Deutsch: Historische Bildtafel mit Abbildungen von Fossilien, die den „Clay over the Upper Oolite“ („Ton oberhalb des Oberen Ooliths“, besser bekannt als Bradford clay, eine tonige Schicht, die einem Hartgrund auflagert, der die Basisfläche der Forest-Marble-Formation in der Gegend von Bradford-on-Avon bildet und ins Bathon, d.h. in den Mittleren Jura, datiert wird[1]) von England kennzeichnen. Diese Bildtafel entstammt der fundamentalen biostratigraphischen Arbeit des Pioniers der modernen Geologie William Smith. Man beachte, dass die Namen der Fossiltaxa sich seither wahrscheinlich geändert haben, hauptsächlich derart, dass zeitgenössische Gattungskonzepte später oft auf Familien oder noch höherrangige Taxa übergingen. Einige der abgebildeten Exemplare sind lediglich informellen Taxa zugeordnet wie der „Pear Encrinus“ („Birnen-Seelilie“) in Fig. 1–3. Dieses Taxon wurde erst 1820 von Schlotheim erstmals unter einem Linné’schen Binomen (Encrinites parkinsonii)[2] und 1821 von Miller unter dem Namen Apiocrinites rotundatus erwähnt[3]. Weil Apiocrinites rotundatus mithin ein jüngeres Synonym von Encrinites parkinsonii und Encrinites eine faktisch bedeutungslose Gattung aus den Anfangstagen der Systematik der fossilen Seelilien ist, wird das Taxon heute unter dem Linné’schen Binomen Apiocrinites parkinsoni geführt.[1]
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Date | (original publication date) |
Source | Plate 3 in: Strata identified by organized fossils, containing prints on colored paper of the most characteristic specimens in each stratum. Part 4 (1819). W. Arding, London, doi:10.5962/bhl.title.106808. |
Author | William Smith (1769–1839) |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:29, 21 February 2019 | 1,977 × 1,400 (3.14 MB) | Gretarsson (talk | contribs) | replaced amateurish screen shot (including icons of the browser or image viewer window) by large and adequately resoluted file | |
09:04, 14 December 2006 | 942 × 667 (98 KB) | Rcashman (talk | contribs) | Engraving from William Smith's guide to classifying rock strata by characteristic fossils. Published in 1815. |
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File change date and time | 16:25, 21 February 2019 |
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Date and time of digitizing | 17:25, 21 February 2019 |
Date metadata was last modified | 17:25, 21 February 2019 |