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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
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.
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- Copyright © Cambridge University Press 1916
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
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