File:Brachios vs bivalves fossil record.svg

Summary[edit]

DescriptionBrachios vs bivalves fossil record.svg	English: Diversity curves of brachiopods and bivalves from the Cambrian to the Pleistocene at the genus level. Deutsch: Diversitätskurven von Armfüßern (Brachiopoda) und Muscheln (Bivalvia) vom Kambrium bis zum Pleistozän auf Gattungsniveau.
Date	1 March 2019
Source	Own work (created using Gnuplot 5.2, based on raw data downloaded from fossilworks.org, for details see below)
Author	Gretarsson
SVG development InfoField	The SVG code is valid.   This chart was created with Gnuplot.    This chart is translated using SVG switch elements: all translations are stored in the same file.

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following license:

This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue

Sources and methods[edit]

The curves in the diagram are based on data obtained from genus occurrence records that were downloaded from fossilworks.org. For Brachiopoda^[1] the raw data set comprised a total of 168,020 occurrences of 3,673 genera, which were extracted from 5,676 references. For Bivalvia^[2] the the raw data set comprised a total of 174,812 occurrences of 2,483 genera, which were extracted from 7,415 references. Most occurrences are placed in so-called 10-million-year bins (10-my bins) by the database software according to the chronostratigraphic assignment of their host rock in the references. The Phanerozoic comprises a total of 49 10-my bins (‘Cambrian 1’ [Fortunian] to ‘Cenozoic 6’ [Upper Miocene + Pliocene + Pleistocene]). The downloaded data set was modified using MS Excel as follows:

• all occurrences that were not assigned to a particular 10-my bin (e.g. when the chronostratigraphy given in the literature was too unprecise, or in all Holocene occurrences) were eliminated from the data set
• multiple occurrences of the same genus per 10-my bin were reduced to one
• the remaining occurrences were summed up for each 10-my bin

The resulting data sets comprised 8,277 occurrences for Brachiopoda and 8,441 occurences for Bivalvia. The occurence values in the diagram are plotted at the ‘mean date’ for each 10-my bin (e.g. the bin ‘Triassic 1’ ranges from −252.3 Ma to −247.2 Ma, so the genus occurence values for this bin are plotted at −249.75 Ma).

References[edit]

1. ↑ Clapham, M. E., W. Kiessling, A. I. Miller, P. J. Wagner, B. Kröger, M. Foote, F. T. Fursich, J. Alroy, M. E. Patzkowsky, S. M. Holland, A. J. W. Hendy, D. J. Bottjer, T. D. Olszewski, M. Aberhan, P. M. Novack-Gottshall, L. C. Ivany, J. Pálfy (2019): Taxonomic occurrences of Brachiopoda, recorded in Fossilworks, the Evolution of Terrestrial Ecosystems database, the Paleobiology Database, and the Paleogeographic Atlas Project database. Fossilworks. http://fossilworks.org archive copy at the Wayback Machine.
2. ↑ Kiessling, W., A. J. W. Hendy, M. E. Clapham, A. I. Miller, M. Aberhan, F. T. Fursich, J. Alroy, P. J. Wagner, M. E. Patzkowsky, M. D. Uhen, M. Foote, J. A. Sessa, D. J. Bottjer, L. C. Ivany, M. T. Carrano, L. Villier, S. M. Holland, B. Kröger, A. J. McGowan, T. D. Olszewski (2019): Taxonomic occurrences of Bivalvia, recorded in Fossilworks, the Evolution of Terrestrial Ecosystems database, the Paleobiology Database, and the Paleogeographic Atlas Project database. Fossilworks. http://fossilworks.org archive copy at the Wayback Machine.