The Great Ordovician Biodiversification Event (GOBE) refers to one of the greatest increases in biodiversity during the Phanerozoic. Recent studies have shown that this taxonomic increase can be attributed to elevated origination rates around the Dapingian-Darriwilian boundary in the Middle Ordovician, while extinction rates stayed relatively constant throughout the Ordovician. Even though this global pattern of origination and extinction appears similar across diverse groups and geographic areas, earlier studies suggested that hard substrate taxa may have diversified prior to the GOBE, during the Early Ordovician. Here, we quantify Ordovician diversification dynamics of hard substrate taxa while simultaneously accounting for temporally varying sampling probabilities. Diversification rates of hard substrate taxa, both as a whole and when analysed as separate groups, appear to be very similar to those of free-living benthic taxa. The observation that the diversification dynamics of many different taxonomic and ecological groups show the same temporal pattern, suggests a common-cause to Ordovician diversification dynamics.

Supplementary File overview for
Franeck and Liow 2020
Did hard substrate taxa diversify prior to the Great Ordovician Biodiversification?

Please note that all RCodes need the csv files
- PBDB_C-S_data.csv
- Rasmussen_Ord_data_stratcorrelation.csv
- Rasmussen_Ord_data_TS.csv
- assignments.csv
as input files. If these files are not accessible for the RCode, the code won't run.
Please specify the file locations in the code before running them.

The RCodes and their usage for the manuscript are as follows:
- R1.covariate.modcomparison.R provides the RCode for the model comparison, AICc estimation and Fig. S6.
- R1.hs.ind.R provides the RCode for the individual parameter estimations of hard substrate taxa
(namely attaching echinoderms, bryozoans, poriferans and corals). This code is the source for Fig. 2 and Figs. S3 and S4.
- R1.hstaxa.vs.fltaxa.R provides the code for the comparison of hard substrate and free-living benthic taxa.
This code is the source for Fig. 1, and Fig. S2.
- R1.comp.Fig.R provides the code for Fig. S3.