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II.—On the Identification of the Acanthoceras mammillatum and Hoplites Interruptus Zones at Okeford Fitzpaine, Dorsetshire

Published online by Cambridge University Press:  01 May 2009

R. Bullen Newton
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Extract

Some molluscan and other remains obtained by Miss Forbes and Miss Lowndes from a brick-pit exposure at Okeford Fitzpaine, near Shillingstone station, Dorsetshire, have recently been submitted to me for determination. They comprise two series of specimens indicative of the well-known Cretaceous zones of Acanthoceras mammillatum and Hoplites interruptus. Those from the former or earlier horizon were collected about nine years ago, whereas the others were obtained within the last few weeks. It will be convenient to name the species identified from the Acanthoceras mammillatum zone first, then to describe the beds constituting the whole of the section, and lastly to give a list of the fauna from the Hoplites interruptus zone.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 5 , May 1896 , pp. 198 - 201
Copyright
Copyright © Cambridge University Press 1896

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References

page 198 note 1 This name has been incorrectly written mammillaris by many authors, though its original rendering was [Ammonites] mammillatus.

page 198 note 2 E. sinuata (synonymous with E. aquila of Continental authors) is not to be confounded with E. Couloni, Defrance (=subsinuata, Leymerie), the latter differing not only in specific details, but characterizing a lower horizon, viz. the Hauterivien stage, or the upper part of the Neocomian strata.

page 199 note 1 I am greatly indebted to Miss Forbes and Miss Lowndes for supplying me with the details of this section. Unfortunately, only the Hoplites interruptus beds are now exposed, the lower part of the section having been filled in.

page 199 note 2 In Reid and Strahan's “Geology of the Isle of Wight” (Mem. Geol. Survey, 1889, p. 279), Ac. mammillatum is stated to have been found in the Chloritic Marl of Mottistone Down, which is probably either a misdetermination or some error has crept in as to the horizon.