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English: Historical plate showing fossils that characterize the Lower Chalk, i.e. the relatively soft white limestones of the lower Upper Cretaceous of England. 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 the historical genus concepts subsequently changed over to family or even higher-ranked taxa. For example, all bivalves referred to as “Inoceramus” in the plate today are considered members of the family Inoceramidae but may be assigned to different genera than Inoceramus. The inoceramid bivalve in figure 2 quite surely represents an elongated form of the genus Mytiloides (erected by Brongniart in 1822). Figure 1 shows a detail or a fragment of the hinge area of a large inoceramid shell (here referred to as „Inoceramus Cuvieri “ with reference to the first formal but rather brief description of an inoceramid species by George Sowerby I in Thomson’s Annals of Philosophy, Vol. 4.[1] The genus “Ammonites” (figure 4) is not even used anymore in ammonite taxonomy.[2]

Deutsch: Historische Bildtafel mit Abbildungen von Fossilien, die den Lower Chalk, d.h. die relativ weichen, weißen Kalksteine der unteren Oberkreide 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 historische Gattungen später konzeptionell oft zu Familien erhoben wurden. Beispielsweise werden heute alle auf der Tafel als “Inoceramus” bezeichneten Muscheln als Mitglieder der Familie Inoceramidae betrachtet, könnten aber in anderen Gattungen als Inoceramus stehen. Bei der Inocerame in Abbildung 2 handelt es sich relativ sicher um eine längliche Form der Gattung Mytiloides (errichtet von Brongniart, 1822). Abbildung 1 zeigt ein Detail oder ein Bruchstück des Schlossrandes einer großen Inoceramenschale (hier bezeichnet als „Inoceramus Cuvieri “, mit Bezug auf die erste formale, wenngleich ziemlich kurze, Beschreibung einer Inoceramenart durch George Sowerby I im 4. Band von Thomson’s Annals of Philosophy[1]). Die Gattung „Ammonites“ (Abbildung 4) wird in der Ammoniten-Taxonomie nicht einmal mehr benutzt.[2]

  1. a b Proceedings of the Linnæan Society, Nov 1 and 15 (1814): A paper by Mr. Sowerby was read on a fossil shell. Annals of Philosophy 4(24):448 (BHL)
  2. a b Francis Hemming, W. J. Arkell (1954): Opinion 305: Suppression, under the Plenary Powers, of the generic name Ammonites Bruguiere, 1789, and addition to the Official List of Generic Names in Zoology of the generic name Arietites Waagen, 1869 (Class Cephalopoda, Order Ammonoidea). Opinions and declarations rendered by the International Commission on Zoological Nomenclature 8(22):297–311 (archive.org)
Date (original publication date)
Source Plate 1 in: Strata identified by organized fossils, containing prints on colored paper of the most characteristic specimens in each stratum. Part 2 (1st October 1816). W. Arding, London, doi:10.5962/bhl.title.106808.
Author William Smith (1769–1839)

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Historical plate showing fossils that characterize the Lower Chalk of England (from William Smith, 1816)

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Date/TimeThumbnailDimensionsUserComment
current17:24, 20 February 2019Thumbnail for version as of 17:24, 20 February 20191,942 × 1,400 (3.38 MB)Gretarssonmuch larger and better resoluted image
09:00, 14 December 2006Thumbnail for version as of 09:00, 14 December 2006978 × 705 (133 KB)RcashmanEngraving of fossils from William Smith's monograph on identifying geological strata using fossils.

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