Abdelhady A, Seuß B, Hassan H (2019)
Publication Language: English
Publication Type: Journal article
Publication year: 2019
Publisher: Palaeontologia Electronica
Book Volume: 22.2.51A
Pages Range: 1-17
Article Number: 22.2.51A
URI: https://palaeo-electronica.org/content/2019/2693-ranking-of-invertebrates
DOI: 10.26879/912
Open Access Link: https://palaeo-electronica.org/content/2019/2693-ranking-of-invertebrates
Fossil groups are used for biochronological dating of rocks for decades. This manuscript
presents a quantitative approach to appraise and compare the quality of
selected taxa as biostratigraphic markers. Based on species occurrence of ammonites,
bivalves, and planktic and benthic foraminifers we evaluate the potential of these to
rank them quantitatively. The spatiotemporal analyses of occurrence data (species
duration, geographic range) were integrated in results of the Unitary Association
method, which measures superpositional contradictions in addition to the generation of
a number of UAs. The results indicate that Jurassic ammonites have the lowest species
duration, and that the majority of species is confined to a single UA-zone. Additionally,
ammonites have the lowest numbers of contradicted bio-events. However,
planktic foraminifers are more valuable at least in the Cenozoic as they have a high
geographic reproducibility and diversity, and higher ISP values. The bivalves and benthic
foraminifers both show longer average species durations and more superpositional
contradictions per species. Therefore, their biostratigraphic potential is more limited at
an interregional scale. The shorter species durations of ammonites and planktic foraminifers
in the studied sections can be attributed to their higher extinction rates. As an
advantage to simple spatio-temporal analyses, the UA-method can accurately assess
the stratigraphic potential of a given taxonomic group. The results obtained herein indicate
that the life-habit has direct impact on the species duration and thus, the stratigraphic
potential of the fossil groups. Based on the results achieved from this study, an
index for ranking fossil groups (Index of Stratigraphic Potential ‘ISP’) is introduced.
APA:
Abdelhady, A., Seuß, B., & Hassan, H. (2019). Stratigraphic ranking of selected invertebrate fossils: A quantitative approach at different temporal and geographic scales. Palaeontologia Electronica, 22.2.51A, 1-17. https://dx.doi.org/10.26879/912
MLA:
Abdelhady, Ahmed, Barbara Seuß, and Hatem Hassan. "Stratigraphic ranking of selected invertebrate fossils: A quantitative approach at different temporal and geographic scales." Palaeontologia Electronica 22.2.51A (2019): 1-17.
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