Oxfordian and Kimmeridgian "Aspidoceras" in the Mediterranean. A methodological approach

A. Checa; F. Olóriz

doi:10.3989/egeol.87435-6618

Oxfordian and Kimmeridgian "Aspidoceras" in the Mediterranean. A methodological approach

Authors

A. Checa Departamento de Estratigrafía y Paleontología, Faeultad de Cieneias de la Universidad de Granada
F. Olóriz Departamento de Estratigrafía y Paleontología, Faeultad de Cieneias de la Universidad de Granada

DOI:

https://doi.org/10.3989/egeol.87435-6618

Keywords:

ammonites, phylogenetic relations, evolution, upper Jurassic, Mediterranean, Aspidoceratidae, Aspidoceras, Pseudowaagenia, Physodoceras, Orthaspidoceras, Benetticeras, Simaspidoceras, Schaireria

Abstract

In this study we present a contrastive analysis of the Null Hypothesis, established as the methodological basis for the evolutive investigation of Mediterranean "Aspidoceras" (Checa & Olóriz, 1985). This contrast is carried out using new data, and is part of a research programme which has been carefully planned. Paleogeographic, sedimentological. stratigraphic and palcobiological considerations have provided new evolutive models which in turn lead to a structural reorganization of thc Null Hypothesis. In this new structure, the Basic Evolutionary Conformations are no longer considcred as mere morphological groupings, the result of a direct reading of thc fossil record. In this way we propose morphological blocks, representing evolutive units which can be related to one another.

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Published

1987-12-30

How to Cite

Checa, A., & Olóriz, F. (1987). Oxfordian and Kimmeridgian "Aspidoceras" in the Mediterranean. A methodological approach. Estudios Geológicos, 43(5-6), 513–520. https://doi.org/10.3989/egeol.87435-6618

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Issue

Vol. 43 No. 5-6 (1987)

Section

Articles

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