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On Jurassic Ammonites from East Africa, collected by Prof. J. W. Gregory

Published online by Cambridge University Press:  01 May 2009

L. F. Spath
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Extract

THE small but very interesting collection of Ammonites described in the following pages was obtained during the summer of 1919 by Professor J. W. Gregory, to whom the writer is indebted for permission to study them. There are seven specimens altogether, three of them fragmentary, and all probably originally pyritized, but now converted into limonite. Though immature or fragmentary, all the specimens were seen to have indications of suture-lines, so that their study promised definite results even if, at first sight, it was difficult to place the fauna in the geological sequence. Superficially, there was greater resemblance to the Lower Cretaceous fauna (with Phylloceras of the heterophyllum group and Lytoceras quadrisulcatum) described from East Africa by Krenkel than to the Sequanian fauna of Mombasa, recorded by Dacqué, and a large series of which is preserved in the British Museum (Nat. Hist.).

Type
Original Articles
Information
Geological Magazine , Volume 57 , Issue 7 , July 1920 , pp. 311 - 320
Copyright
Copyright © Cambridge University Press 1920

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References

page 311 note 1 “Die Untere Kreide von Deutsch-Ostafrika”: Beitr. Pal. Geol. Ost.-Ung., Vol. xxiii, pt. iv, 1910, pp. 201–50, 4 plates.Google Scholar

page 311 note 2 “Dogger und Malm aus Ostafrika”: ib., Vol. xxiii, pt. i, 1910, pp. 1–63, 6 plates.Google Scholar

page 312 note 1 The zone of Macrocephalites macrocephalus (Cornbrash) should be included in the Bathonian, and the Callovian considered to begin with the zone of Proplanulites Koenigi. This is contrary to Continental usage: but the (English) type successions should be adhered to.

page 313 note 1 “Beitr. Geol. Nied. Ind.”: Palœontographica, Supp., vol. iv, pt. i, 3. “Oxford v. Wai Galo,” 1907, pl. xiv, figs. 4b, 5.Google Scholar

page 313 note 2 Op. cit., 1910, PP. 6, 7, pl. i, figs. 1–3.Google Scholar

page 313 note 3 Op. cit., 1890, pl. ii, fig. lb.Google Scholar

page 314 note 1 “Amm. Fauna d. Kelloway v Villány”: Beitr. Pal. Geol. Öst.-Ung.. vol. xxiv, pt. ii, 1911, p. 255.Google Scholar

page 314 note 2 “D Dogger a. Espinazito Pass”: Pal. Abh. Dames, N.F., vol. iv, pt. ii, 1898, p. 29, pl. v (xviii), fig. 2.Google Scholar

page 314 note 3 Op. cit., p. 33.Google Scholar

page 314 note 4 “Les Chaines Subalpines, etc.”: Bull. Service Carte Géol. France, iii, No. 21, 1891, p. 74.Google Scholar

page 315 note 1 “Jurafossil. aus Alaska”: Verb. Russ. Kais. Mineral. Ges. St. Petersb., ser. ii, vol. xxxviii. 1900, p. 247, pl. vii, fig. 1.Google Scholar

page 315 note 2 Faune Giur. & Lias., pt. i, 1872, p. 6, pl. i, fig. 1;Google Scholar pt. v, 1877, p. 130, pl. xix. fig. 16.Google Scholar

page 315 note 3 “Jurastudien,” ii: loc. cit., p. 309, pl. xii, figs. 2, 3.Google Scholar

page 315 note 4 “Üb. Fauna Ool. Cap San Vigilio”: Abh. k.k. R.A., Vienna, vol xii, 1886, p. 69.Google Scholar

page 315 note 5 “Die Fauna ält. Jurabild. N.O. Bakony”: Mitt. Jahrb. Ungar. Geol. Anst., vol. xv, 1904, p. 40.Google Scholar

page 315 note 6 Jullien's (C. R. somm. Soc. Géol. France, June 19, 1911) divisions and speculations on sexual dimorphism among Phylloceras also seem unfounded.Google Scholar

page 315 note 7 Ib., p. 38, pl. xxvii, fig. 2.Google Scholar

page 316 note 1 Loc. cit., pl. xii, fig. 4c.Google Scholar

page 317 note 1 Loc. cit., p. 252.Google Scholar

page 317 note 2 Loc. cit., p. 38, pl. xxvii, figs. 3, 4.Google Scholar

page 317 note 3 Loc. cit., 1852, pl. ii, figs. 1–3.Google Scholar

page 317 note 4 Loc. cit., 1905, pl. ix, fig. 9 especially.Google Scholar

page 317 note 5 Loc. cit., 1910, p. 254.Google Scholar

page 317 note 6 Loc. cit., 1871, pl. xii, fig. 7 (inner whorl).Google Scholar

page 317 note 7 Üb. Trias u. Jura i. d. Südalpen”: Geogn Pal. Beitr., 1865, p. 184, pl. vii, figs. 1. 2.Google Scholar

page 317 note 8 Beitr. Revision Amm. Schwäb. Jura, 1893, pt. i, p. 29.Google Scholar

page 318 note 1 “Étude sur les Moll et brach. de l'Oxf. Inf. d. Jura Bern.”: Mém. Soc. Pal. Suisse, vol. xxv, 1898, p. 110, pl. viii, figs. 8–12 and text-fig. 29 on p. 111.Google Scholar

page 318 note 2 Traité de Géologie, vol. ii. fasc. 2, 1908, p. 1023.Google Scholar

page 318 note 3 “Jurassic Fauna of Kutch”: Pal. Indica, ser. ix, vol. i, 1873, p. 25, pl. v, fig. 2.Google Scholar

page 318 note 4 Loc. cit., 1892, p. 33.Google Scholar

page 319 note 1 = Ph. tatricum (Pusch) in d'Orbigny. Ter. Jurass., pl. 180 (Oppel, Pal. Mitt., 1863, p. 216).Google Scholar

page 319 note 2 Loc. cit., 1910, p. 259.Google Scholar

page 319 note 3 La, Faune du Callovien des Deux-Sèvres, 1915, p. 89.Google Scholar

page 319 note 4 “Études sur les Moll. et Brach. de l'Oxf. Inf. d. Jura Lédonien”: Mém. Soc. Pal. Suisse vol. xxvii, 1900, p. 11, p1. i, figs. 1, 2; pl. ii, fig. 1.Google Scholar

page 319 note 5 Loc. cit., 1910, pl. v, figs. 3a, 3b.Google Scholar

page 319 note 6 Loc. cit., 1891, pp. 70, 73.Google Scholar

page 319 note 7 Loc. cit., Revision, 1893, p. 32.Google Scholar

page 319 note 8 Loc. cit., 1886, pl. v, figs. 15–20.Google Scholar

page 320 note 1 “Jurassic Ammonites from Jebel Zaghuan”: Q.J.G.S., vol. lxix, 1913, p. 561.Google Scholar

page 320 note 2 Loc. cit., 1905, text-fig. 6 on p. 15.Google Scholar

page 320 note 3 Loc. cit., 1904, pl. xxxvi, fig. 8.Google Scholar

page 320 note 4 Hochstetter (loc. cit., p. 142) states that Ph. mediterraneum begins in the Klaus Beds and ranges into the Tithonian. This vertical range is unusually great for a species group, even of a Phylloceras.Google Scholar

page 320 note 5 Loc. cit., pp. 70, 73.Google Scholar