Ammonoid morphological signal versus sea-level changes
P. NEIGE a1, D. MARCHAND a1andA. BONNOT a1 a1 Centre des Sciences de la Terre & UMR CNRS 5561,
Université de Bourgogne, 6 boulevard Gabriel,
F-21000 Dijon, France
Abstract
The morphological diversity, considered as a biological
signal, of a series of four Upper Callovian (Middle Jurassic)
ammonite populations of Côte-d’Or (France) is quantified.
These populations fall within two third-order sequences of a
second-order transgression. A sampling method that adheres as closely
as possible to the morphological characteristics of the populations
is established. It is valuable in that it eliminates the subjectivity
related to taxonomy to allow more objective comparisons between the
biological signal (shell morphology) and the physical signal
(eustasy).
(Received November 4 1996) (Accepted January 6 1997)
