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A biostratigraphic method based on a quantification of the characters of Devonian tracheophytes

Published online by Cambridge University Press:  08 February 2016

Philippe Gerrienne  and
Maurice Streel
Philippe Gerrienne
Affiliation:
Services associés de Paléontologie, Université de Liège, Place du Vingt Août 7, B-4000 Liège, Belgium
Maurice Streel
Affiliation:
Services associés de Paléontologie, Université de Liège, Place du Vingt Août 7, B-4000 Liège, Belgium
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Abstract

Biostratigraphic applications of Devonian plant macrofossils are unusual because of the rarity of these fossil plants. Moreover, the taxonomic determination of these plants is too often either arguable or impossible. Here is proposed a biostratigraphic method based on a quantification of individual plant characters and not on determination of whole fossils. The method is the following: (1) each biocharacter found at a given locality receives a score according to whether it is primitive or derived, so that the biocharacter score increases with increasing derivation; (2) the biostratigraphic coefficients of well-dated localities are calculated, the biostratigraphic coefficient of a given plant locality being the mean of all the biocharacter scores of this locality; (3) the scores of these well-dated localities are used to build a reference scale to which localities under investigation will be compared. A detailed example is developed for Early Devonian times. Various plant biocharacters of seven fossiliferous outcrops have been quantified and the subsequent scores of these localities are presented. This example shows that biostratigraphic results obtained by using the quantification method are comparable in precision with dating based on palynological assemblage zones. Evolutionary aspects of the method are also discussed.

Type
Articles
Information
Paleobiology , Volume 20 , Issue 2 , Spring 1994 , pp. 208 - 214
Copyright
Copyright © The Paleontological Society 

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