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IV.—Datum-lines in the English Keuper

Published online by Cambridge University Press:  01 May 2009

R. L. Sherlock
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Extract

In the almost complete absence of fossils in the British Keuper there has been a lack of datum-lines in that formation by which we may compare the horizons of different sections. Yet in such a thick and widely spread deposit it is very desirable to have subdivisions enabling us to give the particular part of the Keuper to which a section belongs. In deposits such as the New Red formations too great stress has been laid on lithology, inevitable perhaps in the scarcity of fossils, but a source of grave errors in correlation. For example, Mr. L. J. Wills thinks that fossils found in the Keuper of Warwick have affinity, not with the Keuper, but with the Muschelkalk of Germany. Again, there are strata in the Permo-Bunter of Nottinghamshire which might be mistaken for Keuper Waterstones, if only lithology was considered. Over small areas a band of sandstone with some peculiarities may be used as a datum-line, as in the Arden district of Warwickshire and in Nottinghamshire, but these are of local value only.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 3 , March 1918 , pp. 120 - 125
Copyright
Copyright © Cambridge University Press 1918

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References

page 120 note 1 “On the Fossiliferous Lower Keuper Rocks of Worcestershire”: Proc. Geol. Assoc., vol. xxi, p. 268, 1910.Google Scholar

page 120 note 2 Sherlock, R. L., “The Relationship of the Permian to the Trias in Nottinghamshire”: Quart. Journ. Geol. Soc., vol. lxvii, p. 82, 1911.Google Scholar

page 120 note 3 Matley, C. A., “The Upper Keuper (or Arden) Sandstone Group and Associated Rocks of Warwickshire”: Quart. Journ. Geol. Soc., vol. lxviii, pp. 252–80, 1912.Google Scholar

page 120 note 4 Smith, B., “The Upper Keuper Sandstones of East Nottinghamshire”: Geol. Mag., 1910, pp. 302–11.CrossRefGoogle Scholar

page 120 note 5 Sherlock, R. L. & Smith, B., Special Reports on the Mineral Resources of Great Britain (Mem. Geol. Surv.), vol. iii, “Gypsum and Anhydrite,” 1915.Google Scholar

page 121 note 1 Jukes-Browne, A. J., Geology of the South-West part of Lincolnshire (Mem. Geol. Surv.), 1885, p. 18.Google Scholar

page 123 note 1 For full section see Bosworth, T. O., The Keuper Marls around Charnwood, Leicester, 1913, p. 117.Google Scholar

page 123 note 2 Vertical sections, Geol. Surv., Sheet 47, No. 6.

page 123 note 3 Special Reports on the Mineral Sources of Great Britain (Mem. Geol. Surv.), vol. iii, p. 26, 1915.

page 124 note 1 Smith, B. in Geology of the Melton Mowbray District and South-East Nottinghamshire (Mem. Geol. Surv.), 1909, p. 16.Google Scholar

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page 124 note 3 Richardson, L., “The Rhætic and Contiguous Deposits of Glamorganshire”: Quart. Journ. Geol. Soc., vol. lxi, p. 399, 1905.Google Scholar