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On an Inverted Mass of Upper Cretaceous Strata near Leighton Buzzard, Bedfordshire; and on an Overlap of the Upper Gault in that Neighbourhood

Published online by Cambridge University Press:  01 May 2009

F. L. Kitchin  and
J. Pringle
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Extract

WE owe to Mr. Lamplugh a description of the lowest beds of the Gault and their junction with the Lower Greensand, as seen in sand-pits on the south side of Leighton Buzzard. Mr. Lamplugh proved the presence of the fauna of the mammillatus zone and found that the fossils preserved in the gritty phosphatic nodules of the lowest bed above the false-bedded sands include Douvilleiceras mammillatum (Schloth.) and the characteristic Desmoceras usually associated with it.

Type
Original Articles
Information
Geological Magazine , Volume 57 , Issue 2 , February 1920 , pp. 52 - 62
Copyright
Copyright © Cambridge University Press 1920

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References

page 52 note 1 Lamplugh, G. W., “Report of an Excursion to Leighton Buzzard”: Proc. Geol. Assoc., vol. xxvi, pt. v, 1915, p. 310.CrossRefGoogle Scholar

page 52 note 12 Specimens of the Desmoceras were submitted to one of the present writers and were identified by him; but he is not responsible for the name under which they were cited in Mr. Lamplugh's report (op. cit., p. 310). For a further account of the species see Jukes-Browne, A. J., The Cretaceous Rocks of Britain, vol. i, “The Gault and Upper Greensand of England” (Mem. Geol. Surv.), 1900, p. 443Google Scholar; also Lamplugh, G. W. & Kitchin, F. L., On the Mesozoic Rocks in some of the Coal Explorations in Kent (Mem. Geol. Surv.), 1911, p. 100.Google Scholar

page 53 note 11 For figures and descriptions see Jacob, C., “Étude sur quelques Ammonites du Crétacé Moyen”: Mém. Soc. Géol. France, Paléontologie, No. 38, 1907, pp. 53–8, pls. vii, viii.Google Scholar

page 53 note 2 Jacob, C., “Études Paléontologiques et Stratigraphiques sur la Partie Moyenne des Terrains Crétacés dans les Alpes Françaises et les Régions voisines”: Trav. Laboratoire de Géologie de la Faeulté des Sciences de l'Université de Grenoble, vol. viii, fasc. ii, 1908, pp. 296–7.Google Scholar Kilian, W., Lethea Geognostica, II. Das Mesozoicum, Bd. iii, Abth. i, “Unterkreide,” Lief, i, 1907, p. 62.Google Scholar G., Müller, “Beitrag zur Kenntniss der Unteren Kreide im Herzogthum Braunschweig”: Jahrb. k. preuss. geol. Landesanst. für 1895, vol. xvi, p. 110, Berlin, 1896.Google Scholar

page 53 note 3 Teall, J. J. H., “The Potton and Wicken Phosphatie Deposits” (Sedgwick Prize Essay), 1875, pp. 20–2.Google Scholar Jukes-Browne, A. J., The Cretaceous Rocks of Britain, vol. i, “The Gault and Upper Greensand of England” (Mem. Geol. Surv.), 1900, p. 297.Google Scholar

page 53 note 4 Op. cit., p. 285.Google Scholar

page 54 note 1 The difference was remarked upon by Jukes-Browne, who pointed out that south of Leighton Buzzard there is a gradual passage down to Lower Greensand, while in this more northerly development there is not. The Cretaceous Rocks of Britain, vol. i, “The Gault and Upper Greensand of England” (Mem. Geol. Surv.), 1900, p. 284.Google Scholar

page 55 note 1 While working at Billington Crossing we estimated that the yield of ammonite specimens in relation to the number of nodules broken open is considerably less than 1 per cent.

page 61 note 1 Davies, A. M. & Pringle, J., “On two deep Borings at Calvert Station (North Buckinghamshire) and on the Palæozoic Floor north of the Thames”: Quart. Journ. Geol. Soc., vol. lxix, pt, ii, 1913, p. 338.Google Scholar

page 61 note 2 Kilian, W., Lethea Geognostica, II. Das Mesozoicum, Bd. iii, Abth. i, “Unterkreide,” Lief, i, 1907, pp. 61–125.Google Scholar

page 61 note 3 Jukes-Browne, A. J., op. cit., 1900, p. 285.Google Scholar

page 61 note 4 Lamplugh, G. W. & Walker, J. F., op. cit., 1903, p. 246.Google Scholar