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XXXIV.—Studies in the Ammonites of the Family Echioceratidæ

Published online by Cambridge University Press:  06 July 2012

A. E. Trueman
Affiliation:
University College of Swansea.
Daisy M. Williams
Affiliation:
University College of Swansea.

Extract

The ammonites dealt with in this paper belong to the family Echioceratidæ (Buckman, T.A., 1913), a varied group of slender, generally evolute forms, usually ornamented by ribs but very rarely tuberculate. In many members of the family the periphery has only a feeble keel, but in some a sharp keel, with or without sulci, may be present.

Ammonites of this family have most frequently been recorded as Ammonites raricostatus, and the raricostate species are by far the best known. The species at present classified with the Echioceratidæ, however, can be roughly grouped, with reference to their form only, as follows :—

1. Raricostate forms, with strong widely spaced ribs and feeble carina, e.g. A. raricostatoides, A. zieteni.

2. Forms with closely spaced ribs, with carina absent or feeble, e.g. A. viticola, A. prorsum.

3. Forms with elevated whorls, bearing regular ribs of moderate strength and with carina and sulci, e.g. A. aplanatum.

4. Forms becoming smooth on the last whorls, which are thin, with an acute keel and obsolescent sulci, e.g. A. macdonnellii.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1925

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References

References to Literature

Bayle, E. (1878), “Fossiles Principaux des Terrains,” Explic. Carte géol. France.Google Scholar
Blake, J. F., and Tate, R. (1876), The Yorkshire Lias.Google Scholar
Böse, , (1894), in Zeitschr. d. Deutsch. geol. Gesell., xlvi.Google Scholar
Buckman, S. S. (19101925), Yorkshire Type Ammonites, vols. i and ii Type Ammonites, vols. iii, iv, and v(in course of publication). These works are referred to in this paper as “T.A.,” with a number indicating the plate or page.Google Scholar
Buckman, S. S. (1917), “Jurassic Chronology. I. Lias,” Quart. Journ. Geol. Soc, vol. lxxiii, p. 267.Google Scholar
Buckman, S. S. (1920), “Jurassic Chronology. I. Lias, Supplement i,” Quart. Journ. Geol. Soc, vol. lxxvi, p. 66.Google Scholar
Cross, J. E. (1875), “Geology of North-West Lincolnshire,” Quart. Journ. Geol. Soc, vol. xxxi, p. 123.Google Scholar
Dumortier, (1867), Études Paléont. sur les Dépôts Jurassiques du Bassin Rhône, II.Google Scholar
Hauer F., Von (1856), “Ueber die Cephalopoden aus dem Lias der Nordöstlichen Alpen,” Denkschr. K. Akad. Wissenseh. Wien, vol. xi.Google Scholar
Hug, O. (1899), “Lias- und Dogger-Ammoniten a. d. Zone d. Freiburg Alpen,” Mem. Soc. Pal. Suisse, xxvi.Google Scholar
Hyatt, A. (1867), “Fossil Cephalopods of the Museum of Comparative Zoology,” Bull. Mus. Comp. Zool., Harv. Coll., i, p. 71.Google Scholar
Hyatt, A. (1889), “The Genesis of the Arietidæ,” Smithson. Contrib. to Knowledge, No. 673.Google Scholar
Lang, W. D. (1914), “The Geology of the Charmouth Cliffs, etc.,” Proc. Geol. Assoc., vol. xxv, p. 293.CrossRefGoogle Scholar
Lee, G. W. (1920), “The Mesozoic Rocks of Applecross, Raasay, and North-East Skye,” Mem. Geol. Sur. Scot.Google Scholar
Lee, G. W. and Bailey, E. B. (1925), “The Pre-Tertiary Geology of Mull, Loch Aline and Oban,” Mem. Geol. Sur. Scot.Google Scholar
D'orbigny, A. (18421849), Paléontologie Française, Terrains Jurassiques, Céphalopodes.Google Scholar
Portlock, J. E. (1843), Report on the Geology of the County of Londonderry, etc.Google Scholar
Quenstedt, F. A. (1856), Der Jura.Google Scholar
Quenstedt, F. A. (1883 and onwards), Die Ammoniten der Swäbischen Jura: Der Schwarze Jura (Lias), vol. i.Google Scholar
Reynès, P. O. M. (1879), Monographie des Ammonites (text incomplete).Google Scholar
Richardson, L. (1918), “The Geology of the Cheltenham–Stratford-on-Avon Railway—The Lias at the Gas Works, Gloucester,” Trans. Woolhope Nat. F. C., vol. for 1914–1917, p. 137.Google Scholar
Schafhautl, C. E. L. Von (1847), “Die Stellung der Baierischen Voralpen im geol. Syst. Leon. u. Bronn,” N. Jahrb., p. 803.Google Scholar
Simpson, M. (1855), The Fossils of the Yorkshire Lias; Described from Nature.Google Scholar
Spath, L. F. (1914), “The Development of Tragophylloceras loscombi,” Quart. Journ. Geol. Soc, vol. lxx, p. 336.CrossRefGoogle Scholar
Spath, L. F. (1923, a), “Shales with ‘Beef,’ Part II, Palæontology,” Quart. Journ. Geol. Soc, vol. lxxix, p. 66.CrossRefGoogle Scholar
Spath, L. F. (1923, b), “Ammonoidea of the Gault,” Palæontographical Society.Google Scholar
Spath, L. F. (1924), “The Ammonites of the Blue Lias,” Proc. Geol. Assoc., vol. xxxv, p. 186.CrossRefGoogle Scholar
Swinnerton, H. H., and Trueman, A. E. (1918), “The Morphology of the Ammonite Septum,” Quart. Journ. Geol. Soc., vol. lxxiii, p. 26.Google Scholar
Trueman, A. E. (1918), “The Lias of South Lincolnshire,” Geol. Mag., N.S., Dec. VI, vol. v, p. 64 and p. 101.CrossRefGoogle Scholar
Trueman, A. E. (1919), “The Evolution of the Liparoceratidæ,” Quart. Journ. Geol. Soc., vol. lxxiv, p. 247.Google Scholar
Trueman, A. E. (1922), “Aspects of Ontogeny in the Study of Ammonite Evolution,” Journal of Geology, vol. xxx, p. 140.CrossRefGoogle Scholar
Vadasz, M. E. (1908), “Die Unterliassische Fauna von Alsorakos im Komitat Nagyküküllö,” Mitt, aus dem Jahrb. d. Kgl. ungar. Geol. Reichsanst., xvi.Google Scholar
Woodward, H. B. (1893), “The Lias of England and Wales,” Mem. Geol. Survey.Google Scholar
Wright, T. (1878, etc.), “Lias Ammonites,” Palæontographical Society.Google Scholar
Zieten, C. H. Von (1830), Die Versteinerungen Würt. Stuttgart.Google Scholar