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XXIX.—An Early Dictyoconus, and the Genus Orbitolina: Their Contemporaneity, Structural Distinction, and Respective Natural Allies

Published online by Cambridge University Press:  06 July 2012

Lieut.-Colonel L. M. Davies
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Abstract

The author summarises recent reports regarding the appearance in Mesozoic rocks of Blanckenhorn's genus Dictyoconus, long supposed to have originated in the Middle Eocene. He figures and describes the best known of these Mesozoic forms, in order to place its age and generic attribution beyond question, and discusses the problem of its relationship to allied genera as affected by its early appearance. He then describes d'Orbigny's contemporary (Cretaceous) genus Orbitolina, with which Dictyoconus has often been confused, in order to show its radical difference in structure and the characteristics of forms which can be more justly regarded as related to it. He also discusses the genotype of Orbitolina, since the species lately quoted as such is unsuitable.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 59 , Issue 3 , 1939 , pp. 773 - 790
Copyright
Copyright © Royal Society of Edinburgh 1939

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