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Notes on the Middle and Upper Chalk of the Cambridge District

Published online by Cambridge University Press:  01 May 2009

A. G. Brighton
A. G. Brighton
Affiliation:
Sedgwick Museum, Cambridge.
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Extract

Of the more recent accounts of the Middle and Upper Chalk of Cambridge, only that of Jukes-Browne employs the definitions of zonal boundaries now usually accepted in England; for the most part, the horizons to which he refers the exposures are correct.

Type
Original Articles
Information
Geological Magazine , Volume 65 , Issue 8 , August 1928 , pp. 368 - 371
Copyright
Copyright © Cambridge University Press 1928

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References

page 368 note 1 Jukes-Browne, A. J., 1903–1904, “The Cretaceous Rocks of Britain,” vols. ii, iii, Mem. Geol. Surv.Google Scholar

page 369 note 1 Fearnsides, W. G., 1904, “Geology,” in Marr and Shipley, Natural History of Cambridgeshire, 8vo, Cambridge.Google Scholar Rastall, R. H., 1910, “Cambridgeshire, Bedfordshire, and West Norfolk,” chap. v, in Geology in the Field, Jubilee volume of the Geologists' Association, 8vo, London.Google Scholar

page 369 note 2 The form usually known a Holaster planus (Mantell). Lambert, M. (1893, Bull. Soc. Sci. Yonne, xlvii, p. 41) erected for this species the genus Sternotaxis, which differs essentially from Holaster in the composition of the plastron. It is unfortunate that the name of a well-established index-fossil should have to be changed; but the awkwardness may in part be overcome by adopting the Geological Survey practice of referring to zones by the trivial name of their index-fossil.Google Scholar

page 369 note 3 Rowe, A. W., 1908, Proc. Geol. Assoc., xx, p. 301 (inter alia). Lambert, J., 1903, Mém. Musée Roy. Hist. Nat. Belgique, ii, p. 48.Google Scholar

page 370 note 1 Afterwards identified by Jukes-Browne (1903, op. cit., ii, p. 18) as Offaster sphaericus Schlüter, and used under that name as the index-fossil of the Upper Cenomanian of Yorkshire.