This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help.
Summary
DescriptionTrilobite diversity EN (cropped).png
English: Graph showing the number of trilobite families from the start of the Middle Devonian to the total extinction at the close of the Upper Permian. Numbers behind the periodes give these numbers. Heights correspond to duration of the Epochs/Ages. Colors code for trilobite orders: Proetida - brown, Phacopida - steelblue, Lichida - clearblue, Harpetida, Odontopleurida and Corynexochida - pink, olive and purple. Based on: Feist, R. (1991). The Late Devonian Trilobite crisis. Historical Biology5: 197-214, and Feist, R. (2002). Trilobites from the latest Frasnian Kellwasser Crisis in North Africa (Mrirt, central Moroccan Meseta). Acta Palaeontologica Polonica 47 (2): 203–210
Date
Source
Own work
Author
Dwergenpaartje
Other versions
This file has been extracted from another file
: Trilobite diversity EN.png
Licensing
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.