The MitchellManica2026 dataset provides the code and input data for the research conducted by Mitchell and Manica in 2026. It contains fossil data located in the Data and Windows folders, modern examples in the DataModern folder, and Approximate Bayesian Computation (ABC) analysis files, including pre-run output simulations, in the ABC folder. The primary purpose of the dataset is to run statistical analyses via the CodeMitchellManica2026.R script. It is important to note that the results from the fossil statistical analyses will differ from the provided code because the Bed B data is excluded from the public dataset due to geoconservation concerns stipulated by the research permit.