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II.—A New Variety of the Ammonite Cœloceras Davæi, from the Lower Lias, Dorset

Published online by Cambridge University Press:  01 May 2009

Wyatt Wingrave
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Extract

Quenstedt described three distinct varieties of Ammonites Davœi, with nine illustrations. They all belonged to the 7 zone of Lower Lias:—

1. Ammonites Davœi, whose tubercles are somewhat clavate and with unsymmetrical prorsiradiate ribs.

2. A. Davœi enodis is continental. It is a small specimen without tubercles, with fine symmetrical and prorsiradiate ribs.

3. A. Davœi nodosissimus is also continental. This variety shows nine large bullate tubercles on each whorl, with close, fine, and symmetrically disposed flexiradiate ribs.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 5 , May 1916 , pp. 196 - 198
Copyright
Copyright © Cambridge University Press 1916

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References

4 Quenstedt, , Die Ammoniten des Schwäbischenjura, 1885.Google Scholar

1 Lang, W. D., “Geology of Charmouth Cliffs”: Proc. Geol. Assoc., vol. xxv. nt. v. 1914.Google Scholar