Biostratigraphy: Interpretations of Oppel's zones

Zones like those of Oppel and Hedberg's Oppel-Zone are commonly interpreted as rock units delimited temporally. A more restricted view is that they are rock units empirically defined by bioevents that occur in the same order in all sections. Methods used by Oppel and definitions proposed by Hed...

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Bibliographic Details
Published inEarth-science reviews Vol. 126; pp. 266 - 274
Main Author Scott, G.H.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.11.2013
Elsevier Sequoia S.A
Subjects
Adequacy
Biofacies
Biostratigraphy
Boundaries
Categories
Chronostratigraphy
Classification
Constraints
Deposition
Earth science
Evolutionary
fossils
Homotaxis
Markers
Rock
rocks
Stratigraphic classification
Stratigraphy
Temporal logic
Chronostratigraphy
Biofacies
Stratigraphic classification
Biostratigraphy
Homotaxis
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Summary:Zones like those of Oppel and Hedberg's Oppel-Zone are commonly interpreted as rock units delimited temporally. A more restricted view is that they are rock units empirically defined by bioevents that occur in the same order in all sections. Methods used by Oppel and definitions proposed by Hedberg are reviewed to assess their adequacy for definition of biostratigraphic units and their ability to support temporal inferences. Although they are usually interpreted as chronostratigraphic units, Oppel defined his zones in stratigraphic space, without temporal reference. In contrast, Hedberg required that bioevents for his Oppel-Zone should be approximately isochronous across their distribution but provided no operational way to identify such bioevents. Neither author clearly indicated how boundaries should be defined. Recourse to a principle of biosynchroneity to support inferences that stratigraphically ordered bioevents are temporal markers conflicts with knowledge of the biogeographies of modern taxa. Evolutionary theory explains why some bioevents occur in the same stratigraphic order but does not support the inference that they are isochronous events. Since its inception biostratigraphy has focused on ordered classifications, like those of Oppel. Stratigraphic codes should allow for a complementary category of biofacies zones that reflect depositional environments and are not constrained to occur in a particular order.
Bibliography:http://dx.doi.org/10.1016/j.earscirev.2013.08.013
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ISSN:0012-8252
1872-6828
DOI:10.1016/j.earscirev.2013.08.013