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The Zonal Position of the Elsworth Rock and its Alleged Equivalent at Upware

Published online by Cambridge University Press:  01 May 2009

W. J. Arkell
W. J. Arkell
Affiliation:
New College, Oxford.
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Extract

(1) The Elsworth Rock of Elsworth and St. Ives is a condensed deposit belonging to the plicatilis zone.

(2) There is no evidence that it contains any ammonites derived from earlier zones. Statements that it does are based on misidentifications.

(3) The Elsworth Rock at Elsworth overlies at least 8½ feet of ironshot clays with thin bands and nodules of limestone, the clays containing abundant ammonites of the cordatus zone and no others.

(4) The so-called Elsworth Rock at Upware is the equivalent of the ironshot cordatus zone developed below the Elsworth Rock at Elsworth.

(5) The true Elsworth Rock (plicatilis zone) is represented at Upware by the Coralline Oolite and Lower Coral Rag.

(6) For convenience in stratigraphical nomenclature it is desirable to group together the condensed ironshot cordatus and plicatilis beds of Elsworth as the Elsworth Series.

(7) The Elsworth Series, as defined in 6, corresponds with the Oolithe ferrugineuse and the greater part of the Oolithe de Trouville on the Normandy coast. At Trouville the plicatilis zone to some extent combines the developments at Elsworth and Upware.

(8) The ironshot cordatus zone was proved in the Upware well to rest directly upon normal clays of the mariae zone, and the same zone was proved in the vale below Elsworth in the Fen Stanton brewery boring.

I am greatly indebted to Mr. E. E. L. Dixon and Mr. A. G. Brighton for criticisms and suggestions, and especially to Mr. Brighton for the trouble he has taken in sending me all the fossils on loan and supplying the relevant information.

Type
Original Articles
Information
Geological Magazine , Volume 74 , Issue 10 , October 1937 , pp. 445 - 458
Copyright
Copyright © Cambridge University Press 1937

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References

REFERENCES

Arkell, W. J., 1933. The Jurassic System in Great Britain, Oxford.Google Scholar
Arkell, W. J., 1936. “The Ammonite Zones of the Upper Oxfordian of Oxford,” Quart. Journ. Geol. Soc., xcii, 146.CrossRefGoogle Scholar
Borissjak, A., 1908. “Die Fauna des Donez Jura, 1, Cephalopoda,” Mém. Com. géol. St. Pétersbourg. N.S. xxxvii, 1.Google Scholar
Buckman, S. S., 1919–1928. Type Ammonites, vols. iii–vii.Google Scholar
Douvillé, R., 1912. “Éitude sur les Cardiocératidés de Dives, Villers-sur-Mer, et quelques autres gisements,” Mém. Soc. géol. France, xix, fasc. 2.Google Scholar
Douvillé, R., 1913. “Sur deux beaux représentants de l'espèce Quenstedliceras praecordatum R.D.,” Bull. Soc. géol. France (4), xiii, 364.Google Scholar
Fearnsides, W. G., 1904. “The Geology of Cambridgeshire,” in Marr and Shipley's Natural History of Cambridgeshire, 9.Google Scholar
Lahusen, I., 1883. “Die Fauna der jurassischen Bildungen des Rjasanschen Gouvernements,” Mém. Com. géol. Russie, i, 1.Google Scholar
Lamplugh, G. W., Kitchin, F. L., and Pringle, J., 1923. “The Concealed Mesozoic Rocks in Kent,” Mem. Geol. Survey.Google Scholar
Loriol, P. de, 1898–1899. “Étude sur les mollusques et brachiopodes de l'Oxfordien inférieur du Jura bernois,” Mèm. Soc. pal. Suisse, xxv, xxvi.Google Scholar
Loriol, P. de, 1900. “Étude sur les mollusques et brachiopodes de l'Oxfordien inférieur du Jura lédonien,” Mém. Soc. pal. Suisse, xxvii.Google Scholar
Orbigny, A. D', 1842–1851. Paléontologie fran¸aise. Terrains jurassiques. Céphalopodes. Paris.Google Scholar
Pavlow, A. P., 1913. “Les Céphalopodes du Jura et du Crétacé inférieur de la Sibérie septentrionale,” Mém. Acad. imp. Sci. St. Pétersbourg, viii Série, Ph.-Math. Classe, vol. xxi, No. 4.Google Scholar
Raspail, J., 1901. “Contribution à létude de la falaise jurassique de Villerssur-Mer,” Feuille des jeunes Naturalistes (4), 31 année, nos. 365–6.Google Scholar
Rigaux, E., 1892. “Notice géologique sur le Bas Boulonnais,” Mém. Soc. académique de Boulogne, xiv, séance du 4 décembre 1889, 1.Google Scholar
Ronchadzé, J., 1917. “Perisphinctes de l' Argovien de Chézery et de la Faucille,” Thèse, Fac. Sci. Univ. Genève, Genève.Google Scholar
Spath, L. F., 1933. “Revision of the Jurassic Cephalopod Fauna of Kachh (Cutch),” part vi, Pal. Indica, N.S., ix, mem. 2.Google Scholar
Wedd, C. B., 1898. “On the Corallian Rocks of Upware (Cambs) ” Quart. Journ. Geol. Soc., liv, 601.CrossRefGoogle Scholar
Wedd, C. B., 1901. “On the Corallian Rocks of St. Ives (Huntingdonshire) and Elsworth,” Ibid., lvii, 73.Google Scholar